Every 1 September to 10 October in Quincy, IL from 1901 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.
| Year | Mean, °F | Rank | High, °F | Rank | Low, °F | Rank | Precipitation, in | Rank | Days missing |
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| 2026 | 71.8 | 5 | 81.9 | 11 | 61.7 | 2 | 3.70 | 71 | 0 |
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| 2025 | 69.5 | 22 | 82.2 | 10 | 56.9 | 32 | 1.49 | 116 | 0 |
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| 2024 | 68.2 | 32 | 80.6 | 26 | 55.8 | 52 | 2.61 | 97 | 0 |
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| 2023 | 68.2 | 32 | 80.5 | 29 | 55.9 | 49 | 0.45 | 125 | 0 |
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| 2022 | 65.5 | 73 | 77.4 | 54 | 53.7 | 77 | 4.22 | 64 | 0 |
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| 2021 | 70.5 | 14 | 81.4 | 16 | 59.7 | 13 | 3.42 | 78 | 0 |
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| 2020 | 64.2 | 91 | 75.1 | 92 | 53.4 | 84 | 2.38 | 102 | 0 |
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| 2019 | 70.8 | 12 | 80.5 | 29 | 61 | 4 | 6.21 | 36 | 0 |
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| 2018 | 70.6 | 13 | 81 | 21 | 60.3 | 8 | 9.45 | 14 | 0 |
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| 2017 | 69.2 | 25 | 80.6 | 26 | 57.8 | 25 | 3.48 | 77 | 0 |
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| 2016 | 69.6 | 20 | 79.5 | 36 | 59.7 | 13 | 4.26 | 63 | 0 |
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| 2015 | 68.5 | 28 | 79.5 | 36 | 57.5 | 27 | 1.28 | 119 | 0 |
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| 2014 | 62.4 | 111 | 72.4 | 117 | 52.4 | 97 | 10.74 | 10 | 1 |
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| 2013 | 69 | 26 | 81.4 | 16 | 56.6 | 37 | 2.16 | 108 | 0 |
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| 2012 | 61.8 | 116 | 73 | 112 | 50.6 | 117 | 3.55 | 75 | 0 |
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| 2011 | 64.2 | 91 | 76.9 | 67 | 51.6 | 107 | 1.16 | 121 | 0 |
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| 2010 | 65.1 | 77 | 76.1 | 78 | 54 | 74 | 2.17 | 107 | 0 |
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| 2009 | 61.6 | 118 | 71.5 | 121 | 51.7 | 105 | 3.99 | 68 | 0 |
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| 2008 | 64.5 | 84 | 74.3 | 102 | 54.8 | 67 | 9.26 | 16 | 0 |
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| 2007 | 70 | 17 | 82.8 | 7 | 57.1 | 28 | 2.56 | 99 | 0 |
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| 2006 | 63.9 | 96 | 75.1 | 92 | 52.7 | 89 | 4.30 | 62 | 0 |
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| 2005 | 68.1 | 34 | 79.2 | 40 | 57 | 29 | 4.03 | 67 | 1 |
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| 2004 | 64.4 | 88 | 76.2 | 77 | 52.6 | 92 | 3.06 | 86 | 0 |
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| 2003 | 61.7 | 117 | 72.9 | 115 | 50.5 | 118 | 3.92 | 69 | 0 |
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| 2002 | 67.8 | 38 | 79.9 | 34 | 55.7 | 55 | 1.56 | 114 | 0 |
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| 2001 | 63.1 | 105 | 74.2 | 104 | 52 | 100 | 5.09 | 48 | 0 |
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| 2000 | 63.6 | 98 | 75.3 | 88 | 51.9 | 102 | 3.60 | 74 | 0 |
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| 1999 | 63.1 | 105 | 75.4 | 87 | 50.9 | 114 | 2.92 | 89 | 0 |
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| 1998 | 67.3 | 45 | 76.6 | 73 | 58 | 23 | 6.69 | 30 | 0 |
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| 1997 | 67.6 | 40 | 78.5 | 46 | 56.7 | 35 | 1.86 | 113 | 0 |
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| 1996 | 60.9 | 123 | 71.5 | 121 | 50.2 | 120 | 2.87 | 92 | 0 |
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| 1995 | 61.2 | 120 | 71 | 124 | 51.4 | 109 | 2.96 | 88 | 0 |
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| 1994 | 64.6 | 82 | 75.1 | 92 | 54 | 74 | 2.90 | 90 | 0 |
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| 1993 | 60.1 | 124 | 69.4 | 126 | 50.9 | 114 | 9.95 | 12 | 0 |
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| 1992 | 63.5 | 100 | 74.5 | 101 | 52.6 | 92 | 3.09 | 85 | 0 |
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| 1991 | 64.2 | 91 | 74.8 | 97 | 53.5 | 80 | 8.10 | 21 | 0 |
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| 1990 | 66.3 | 59 | 77 | 61 | 55.6 | 57 | 4.70 | 54 | 0 |
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| 1989 | 61 | 122 | 72.1 | 119 | 50 | 122 | 3.20 | 81 | 0 |
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| 1988 | 64.9 | 78 | 77.2 | 56 | 52.5 | 95 | 1.54 | 115 | 0 |
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| 1987 | 62.3 | 112 | 74.1 | 105 | 50.4 | 119 | 2.16 | 108 | 1 |
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| 1986 | 67.6 | 40 | 77.5 | 53 | 57.6 | 26 | 13.09 | 3 | 0 |
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| 1985 | 63.3 | 102 | 73 | 112 | 53.5 | 80 | 4.94 | 49 | 0 |
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| 1984 | 64.1 | 94 | 74.6 | 99 | 53.6 | 79 | 4.39 | 60 | 0 |
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| 1983 | 67.3 | 45 | 78.8 | 44 | 55.8 | 52 | 3.64 | 72 | 0 |
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| 1982 | 65.9 | 66 | 75.5 | 84 | 56.3 | 43 | 4.47 | 58 | 0 |
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| 1981 | 62.8 | 110 | 73.8 | 108 | 51.8 | 103 | 2.79 | 93 | 0 |
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| 1980 | 67 | 48 | 78.2 | 48 | 55.8 | 52 | 5.46 | 44 | 0 |
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| 1979 | 64.5 | 84 | 77.1 | 58 | 51.8 | 103 | 0.52 | 124 | 0 |
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| 1978 | 68.1 | 34 | 79.4 | 39 | 56.9 | 32 | 9.79 | 13 | 0 |
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| 1977 | 64.7 | 81 | 73 | 112 | 56.4 | 41 | 14.00 | 2 | 0 |
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| 1976 | 63.4 | 101 | 75.6 | 81 | 51.2 | 110 | 5.90 | 41 | 0 |
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| 1975 | 62.1 | 113 | 73.2 | 111 | 51 | 112 | 6.35 | 32 | 0 |
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| 1974 | 58.4 | 126 | 70 | 125 | 46.8 | 126 | 1.49 | 116 | 0 |
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| 1973 | 67.2 | 47 | 75.5 | 84 | 59 | 17 | 9.33 | 15 | 0 |
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| 1972 | 66.7 | 52 | 76.9 | 67 | 56.5 | 39 | 3.49 | 76 | 0 |
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| 1971 | 66.6 | 54 | 77.1 | 58 | 56 | 47 | 7.23 | 24 | 0 |
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| 1970 | 66.2 | 61 | 75.6 | 81 | 56.8 | 34 | 11.45 | 7 | 0 |
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| 1969 | 66.8 | 51 | 77 | 61 | 56.5 | 39 | 8.84 | 17 | 0 |
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| 1968 | 63.3 | 102 | 73.8 | 108 | 52.7 | 89 | 6.49 | 31 | 0 |
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| 1967 | 63.1 | 105 | 74.1 | 105 | 52 | 100 | 5.13 | 47 | 0 |
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| 1966 | 61.2 | 120 | 72.9 | 115 | 49.6 | 123 | 5.91 | 40 | 0 |
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| 1965 | 62.9 | 109 | 72.4 | 117 | 53.5 | 80 | 7.17 | 27 | 0 |
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| 1964 | 63.6 | 98 | 75 | 96 | 52.2 | 98 | 2.77 | 94 | 0 |
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| 1963 | 68.5 | 28 | 80.9 | 25 | 56.2 | 44 | 1.88 | 112 | 0 |
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| 1962 | 64.4 | 88 | 74.6 | 99 | 54.2 | 71 | 4.78 | 52 | 0 |
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| 1961 | 65.5 | 73 | 75.6 | 81 | 55.3 | 62 | 10.90 | 9 | 0 |
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| 1960 | 68 | 37 | 80 | 33 | 56 | 47 | 0.89 | 123 | 0 |
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| 1959 | 65.7 | 69 | 75.2 | 91 | 56.1 | 46 | 6.82 | 29 | 0 |
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| 1958 | 64.5 | 84 | 75.3 | 88 | 53.7 | 77 | 2.61 | 97 | 0 |
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| 1957 | 63.1 | 105 | 75.3 | 88 | 51 | 112 | 2.38 | 102 | 0 |
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| 1956 | 66.3 | 59 | 80.1 | 32 | 52.5 | 95 | 0.33 | 126 | 0 |
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| 1955 | 67 | 48 | 79.2 | 40 | 54.9 | 65 | 7.21 | 26 | 0 |
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| 1954 | 69.3 | 24 | 81.6 | 13 | 57 | 29 | 5.36 | 45 | 0 |
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| 1953 | 66.4 | 56 | 81 | 21 | 51.7 | 105 | 3.03 | 87 | 0 |
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| 1952 | 62 | 114 | 76.5 | 75 | 47.5 | 125 | 2.50 | 101 | 0 |
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| 1951 | 61.4 | 119 | 71.9 | 120 | 50.9 | 114 | 4.04 | 66 | 0 |
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| 1950 | 63.2 | 104 | 74.8 | 97 | 51.6 | 107 | 1.37 | 118 | 0 |
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| 1949 | 61.9 | 115 | 73.6 | 110 | 50.2 | 120 | 6.32 | 33 | 0 |
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| 1948 | 65.7 | 69 | 77 | 61 | 54.4 | 70 | 3.61 | 73 | 0 |
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| 1947 | 70.9 | 9 | 82.7 | 9 | 59 | 17 | 4.88 | 50 | 0 |
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| 1946 | 68.3 | 30 | 80.5 | 29 | 56.2 | 44 | 3.11 | 83 | 0 |
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| 1945 | 65.2 | 76 | 75.5 | 84 | 54.9 | 65 | 11.20 | 8 | 1 |
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| 1944 | 67.4 | 43 | 76.6 | 73 | 58.2 | 22 | 10.47 | 11 | 0 |
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| 1943 | 64.8 | 79 | 77 | 61 | 52.6 | 92 | 2.29 | 105 | 0 |
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| 1942 | 66 | 64 | 77.7 | 52 | 54.2 | 71 | 4.45 | 59 | 0 |
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| 1941 | 69.6 | 20 | 80.6 | 26 | 58.6 | 19 | 12.28 | 4 | 0 |
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| 1940 | 66.1 | 62 | 81 | 21 | 51.2 | 110 | 2.67 | 96 | 0 |
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| 1939 | 70.9 | 9 | 85.5 | 1 | 56.4 | 41 | 0.98 | 122 | 0 |
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| 1938 | 69.8 | 19 | 82.9 | 6 | 56.7 | 35 | 1.25 | 120 | 0 |
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| 1937 | 68.8 | 27 | 81.6 | 13 | 55.9 | 49 | 2.22 | 106 | 0 |
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| 1936 | 71.4 | 6 | 81 | 21 | 61.7 | 2 | 11.63 | 6 | 0 |
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| 1935 | 65.7 | 69 | 76.7 | 72 | 54.8 | 67 | 3.20 | 81 | 0 |
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| 1934 | 66.4 | 56 | 77.1 | 58 | 55.7 | 55 | 6.23 | 35 | 0 |
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| 1933 | 71.9 | 4 | 83.9 | 5 | 60 | 10 | 2.31 | 104 | 0 |
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| 1932 | 66 | 64 | 77.2 | 56 | 54.8 | 67 | 5.98 | 39 | 0 |
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| 1931 | 75.2 | 1 | 85.2 | 2 | 65.2 | 1 | 8.14 | 20 | 1 |
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| 1930 | 72.5 | 3 | 84.2 | 4 | 60.9 | 5 | 4.32 | 61 | 0 |
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| 1929 | 66.4 | 56 | 77.3 | 55 | 55.4 | 60 | 4.10 | 65 | 0 |
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| 1928 | 67 | 48 | 78.6 | 45 | 55.4 | 60 | 4.58 | 57 | 0 |
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| 1927 | 70.9 | 9 | 81.9 | 11 | 60 | 10 | 6.11 | 38 | 0 |
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| 1926 | 68.3 | 30 | 76.5 | 75 | 60.1 | 9 | 14.30 | 1 | 0 |
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| 1925 | 71 | 8 | 81.1 | 19 | 60.9 | 5 | 7.71 | 23 | 0 |
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| 1924 | 65.4 | 75 | 77 | 61 | 53.9 | 76 | 4.85 | 51 | 0 |
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| 1923 | 67.7 | 39 | 78.4 | 47 | 57 | 29 | 7.07 | 28 | 0 |
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| 1922 | 71.3 | 7 | 82.8 | 7 | 59.8 | 12 | 4.69 | 55 | 0 |
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| 1921 | 70.1 | 15 | 81.1 | 19 | 59.2 | 15 | 8.52 | 18 | 0 |
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| 1920 | 70.1 | 15 | 81.6 | 13 | 58.6 | 19 | 4.77 | 53 | 0 |
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| 1919 | 73 | 2 | 85.1 | 3 | 60.8 | 7 | 4.60 | 56 | 0 |
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| 1918 | 64.4 | 88 | 76.8 | 70 | 52.2 | 98 | 3.85 | 70 | 1 |
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| 1917 | 64.8 | 79 | 76.8 | 70 | 52.7 | 89 | 3.21 | 80 | 0 |
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| 1916 | 66.6 | 54 | 79.1 | 42 | 54.2 | 71 | 2.90 | 90 | 0 |
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| 1915 | 66.1 | 62 | 76.9 | 67 | 55.3 | 62 | 7.99 | 22 | 0 |
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| 1914 | 69.4 | 23 | 79.8 | 35 | 59.1 | 16 | 7.23 | 24 | 0 |
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| 1913 | 69.9 | 18 | 81.3 | 18 | 58.5 | 21 | 2.03 | 111 | 0 |
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| 1912 | 68.1 | 34 | 79.5 | 36 | 56.6 | 37 | 2.72 | 95 | 0 |
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| 1911 | 67.4 | 43 | 77 | 61 | 57.9 | 24 | 12.21 | 5 | 0 |
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| 1910 | 64.5 | 84 | 74 | 107 | 55.1 | 64 | 5.76 | 42 | 0 |
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| 1909 | 64.1 | 94 | 75.1 | 92 | 53.2 | 85 | 5.26 | 46 | 1 |
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| 1908 | 65.9 | 66 | 78.2 | 48 | 53.5 | 80 | 2.55 | 100 | 0 |
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| 1907 | 64.6 | 82 | 76.1 | 78 | 53.1 | 87 | 2.13 | 110 | 0 |
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| 1906 | 67.5 | 42 | 79 | 43 | 55.9 | 49 | 5.56 | 43 | 4 |
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| 1905 | 66.7 | 52 | 77.9 | 51 | 55.5 | 59 | 6.26 | 34 | 0 |
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| 1904 | 65.8 | 68 | 76.1 | 78 | 55.6 | 57 | 8.45 | 19 | 0 |
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| 1903 | 63.7 | 97 | 74.3 | 102 | 53.1 | 87 | 6.19 | 37 | 0 |
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| 1902 | 60.1 | 124 | 71.4 | 123 | 48.9 | 124 | 3.41 | 79 | 0 |
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| 1901 | 65.6 | 72 | 78 | 50 | 53.2 | 85 | 3.10 | 84 | 0 |
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