Every March in Spencer, IA from 1895 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 | 39 | 11 | 53.5 | 2 | 24.4 | 39 | 1.13 | 73 | 0 |
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| 2025 | 40.2 | 4 | 53.5 | 2 | 27 | 16 | 2.50 | 19 | 0 |
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| 2024 | 38 | 17 | 51.5 | 10 | 24.4 | 39 | 2.35 | 23 | 0 |
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| 2023 | 29.8 | 76 | 38.8 | 78 | 20.9 | 71 | 1.54 | 46 | 0 |
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| 2022 | 35.3 | 36 | 45.5 | 41 | 25.1 | 35 | 1.41 | 55 | 0 |
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| 2021 | 40.2 | 4 | 51.4 | 11 | 28.8 | 8 | 1.60 | 39 | 1 |
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| 2020 | 38.5 | 14 | 47.9 | 24 | 29 | 6 | 2.40 | 22 | 0 |
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| 2019 | 29.3 | 78 | 38.3 | 84 | 20.4 | 75 | 1.42 | 54 | 0 |
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| 2018 | 33.3 | 52 | 40.3 | 69 | 26.2 | 23 | 2.46 | 20 | 0 |
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| 2017 | 33.5 | 51 | 43.2 | 53 | 23.9 | 46 | 1.36 | 58 | 0 |
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| 2016 | 39.6 | 7 | 50.7 | 13 | 28.5 | 10 | 1.52 | 47 | 0 |
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| 2015 | 37.9 | 19 | 51.6 | 8 | 24.1 | 43 | 0.56 | 99 | 0 |
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| 2014 | 28.8 | 80 | 39.3 | 76 | 18.3 | 90 | 0.38 | 103 | 0 |
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| 2013 | 27.5 | 91 | 35.7 | 96 | 19.3 | 82 | 1.18 | 68 | 0 |
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| 2012 | 49.5 | 1 | 61.9 | 1 | 37.1 | 1 | 0.87 | 83 | 0 |
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| 2011 | 31.4 | 68 | 39.9 | 72 | 22.8 | 55 | 0.54 | 100 | 0 |
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| 2010 | 35.3 | 36 | 44.4 | 49 | 26.2 | 23 | 1.22 | 65 | 2 |
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| 2009 | 34.3 | 43 | 44.5 | 47 | 24.1 | 43 | 1.26 | 63 | 0 |
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| 2008 | 27.3 | 92 | 35.8 | 95 | 18.8 | 86 | 0.58 | 96 | 0 |
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| 2007 | 38 | 17 | 47.5 | 26 | 28.5 | 10 | 3.53 | 8 | 0 |
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| 2006 | 32.8 | 54 | 41.8 | 61 | 23.8 | 48 | 2.64 | 16 | 0 |
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| 2005 | 33.8 | 48 | 45.2 | 43 | 22.4 | 59 | 0.23 | 108 | 0 |
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| 2004 | 39.5 | 8 | 49.8 | 16 | 29.3 | 3 | 2.55 | 18 | 0 |
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| 2003 | 32.6 | 56 | 45.4 | 42 | 19.8 | 78 | 2.18 | 24 | 0 |
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| 2002 | 25.4 | 103 | 34.6 | 104 | 16.2 | 100 | 0.85 | 85 | 0 |
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| 2001 | 26 | 99 | 33.3 | 105 | 18.8 | 86 | 0.08 | 112 | 0 |
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| 2000 | 40 | 6 | 52.8 | 5 | 27.1 | 15 | 0.95 | 79 | 0 |
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| 1999 | 35.1 | 40 | 46.3 | 33 | 23.9 | 46 | 0.12 | 110 | 1 |
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| 1998 | 28.7 | 81 | 36 | 91 | 21.4 | 70 | 2.00 | 30 | 0 |
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| 1997 | 32.5 | 60 | 42.2 | 57 | 22.8 | 55 | 0.33 | 105 | 0 |
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| 1996 | 27.8 | 89 | 38.8 | 78 | 16.4 | 99 | 1.14 | 72 | 1 |
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| 1995 | 34 | 47 | 42 | 60 | 26 | 27 | 2.73 | 14 | 0 |
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| 1994 | 36.2 | 31 | 46.2 | 34 | 26.2 | 23 | 0.09 | 111 | 0 |
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| 1993 | 27.3 | 92 | 35.1 | 99 | 19.5 | 79 | 1.44 | 53 | 0 |
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| 1992 | 35.5 | 34 | 44.3 | 50 | 26.8 | 19 | 2.06 | 29 | 0 |
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| 1991 | 35.3 | 36 | 45.1 | 44 | 25.5 | 30 | 3.16 | 11 | 0 |
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| 1990 | 35.9 | 32 | 45.6 | 39 | 26.3 | 21 | 2.64 | 16 | 0 |
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| 1989 | 29.9 | 75 | 39.3 | 76 | 20.6 | 73 | 0.59 | 95 | 0 |
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| 1988 | 36.8 | 26 | 48.1 | 20 | 25.5 | 30 | 0.74 | 90 | 0 |
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| 1987 | 37.7 | 21 | 47.5 | 26 | 27.9 | 13 | 3.07 | 12 | 0 |
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| 1986 | 37.3 | 24 | 47.5 | 26 | 27 | 16 | 1.59 | 40 | 0 |
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| 1985 | 37.7 | 21 | 46.4 | 31 | 29 | 6 | 3.67 | 6 | 0 |
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| 1984 | 25.3 | 104 | 32.5 | 107 | 18 | 92 | 1.51 | 48 | 0 |
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| 1983 | 32.6 | 56 | 39.4 | 75 | 25.8 | 29 | 4.08 | 3 | 0 |
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| 1981 | 38.5 | 14 | 51.9 | 7 | 25.1 | 35 | 1.19 | 67 | 0 |
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| 1980 | 30.5 | 72 | 40.3 | 69 | 20.6 | 73 | 0.90 | 82 | 0 |
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| 1979 | 27.2 | 95 | 35 | 100 | 19.5 | 79 | 3.47 | 9 | 0 |
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| 1978 | 33.7 | 49 | 44 | 52 | 23.3 | 50 | 0.57 | 97 | 0 |
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| 1977 | 38.7 | 12 | 48.1 | 20 | 29.3 | 3 | 4.60 | 1 | 0 |
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| 1976 | 33.7 | 49 | 43.2 | 53 | 24.2 | 41 | 3.71 | 5 | 0 |
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| 1975 | 22.9 | 107 | 31.9 | 108 | 13.9 | 106 | 2.15 | 25 | 0 |
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| 1974 | 35.3 | 36 | 44.2 | 51 | 25 | 37 | 1.20 | 66 | 2 |
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| 1972 | 31.6 | 67 | 40.9 | 66 | 22.4 | 59 | 1.09 | 74 | 0 |
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| 1971 | 28.6 | 82 | 37.3 | 89 | 20 | 77 | 1.18 | 68 | 0 |
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| 1970 | 26.5 | 97 | 35.3 | 97 | 17.7 | 93 | 1.89 | 31 | 0 |
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| 1969 | 20.9 | 108 | 31.2 | 109 | 10.5 | 110 | 1.47 | 52 | 0 |
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| 1967 | 37.7 | 21 | 48.9 | 18 | 25.4 | 32 | 0.41 | 102 | 1 |
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| 1966 | 37.9 | 19 | 49.5 | 17 | 26.2 | 23 | 0.80 | 88 | 0 |
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| 1965 | 20.7 | 109 | 28.1 | 111 | 13.3 | 109 | 2.70 | 15 | 0 |
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| 1964 | 26.5 | 97 | 38.4 | 83 | 14.6 | 105 | 1.05 | 76 | 0 |
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| 1963 | 37 | 25 | 48 | 22 | 26 | 27 | 1.31 | 60 | 0 |
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| 1962 | 24.1 | 106 | 32.7 | 106 | 15.5 | 104 | 1.68 | 36 | 0 |
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| 1961 | 32.8 | 54 | 40.4 | 68 | 25.3 | 34 | 3.67 | 6 | 0 |
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| 1960 | 17.2 | 112 | 27.6 | 112 | 6.7 | 113 | 1.40 | 56 | 0 |
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| 1959 | 32.1 | 64 | 42.2 | 57 | 21.9 | 63 | 2.14 | 26 | 0 |
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| 1958 | 32.2 | 62 | 41.1 | 65 | 23.3 | 50 | 0.46 | 101 | 0 |
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| 1957 | 31.7 | 66 | 41.6 | 63 | 21.9 | 63 | 1.29 | 61 | 0 |
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| 1956 | 28.2 | 85 | 37.5 | 88 | 18.8 | 86 | 0.85 | 85 | 0 |
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| 1955 | 28.4 | 83 | 39.5 | 74 | 17.3 | 96 | 0.34 | 104 | 0 |
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| 1954 | 27.9 | 88 | 36.3 | 90 | 19.5 | 79 | 1.67 | 37 | 0 |
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| 1953 | 32.3 | 61 | 42.6 | 55 | 21.9 | 63 | 2.94 | 13 | 0 |
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| 1952 | 27.1 | 96 | 34.8 | 102 | 19.3 | 82 | 1.55 | 44 | 0 |
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| 1951 | 19.5 | 110 | 29.1 | 110 | 10 | 111 | 4.29 | 2 | 0 |
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| 1950 | | | | | 18.4 | 89 | 0.94 | 80 | 4 |
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| 1949 | 30.7 | 71 | 38.7 | 80 | 22.4 | 59 | 1.58 | 41 | 1 |
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| 1948 | 27.3 | 92 | 38.7 | 80 | 15.9 | 103 | | | 0 |
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| 1947 | 29.8 | 76 | 38.2 | 85 | 21.5 | 68 | 0.18 | 109 | 0 |
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| 1946 | 42.2 | 2 | 51.6 | 8 | 32.7 | 2 | | | 0 |
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| 1945 | 40.9 | 3 | 53.2 | 4 | 28.6 | 9 | 1.58 | 41 | 0 |
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| 1943 | 28.4 | 83 | 40.7 | 67 | 16.1 | 102 | 1.56 | 43 | 0 |
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| 1942 | 36.4 | 28 | 44.6 | 46 | 28.1 | 12 | 2.07 | 28 | 0 |
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| 1941 | 31.3 | 69 | 39.7 | 73 | 22.7 | 57 | 1.24 | 64 | 1 |
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| 1940 | 28.1 | 86 | 35.9 | 93 | 20.4 | 75 | 1.49 | 50 | 0 |
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| 1939 | 34.5 | 41 | 46.4 | 31 | 22.6 | 58 | 0.57 | 97 | 0 |
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| 1938 | 39.5 | 8 | 50 | 15 | 29.1 | 5 | 1.51 | 48 | 0 |
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| 1937 | 30.9 | 70 | 40 | 71 | 21.7 | 67 | 2.09 | 27 | 0 |
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| 1936 | 34.1 | 45 | 44.5 | 47 | 23.7 | 49 | 1.16 | 70 | 0 |
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| 1935 | 38.6 | 13 | 50.1 | 14 | 27 | 16 | 1.34 | 59 | 0 |
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| 1934 | 32.2 | 62 | 46.2 | 34 | 18.2 | 91 | 0.86 | 84 | 0 |
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| 1933 | 32.6 | 56 | 42.2 | 57 | 23 | 53 | 3.77 | 4 | 0 |
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| 1932 | 25.7 | 101 | 34.7 | 103 | 16.6 | 98 | 1.48 | 51 | 0 |
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| 1931 | 34.5 | 41 | 45.1 | 44 | 24 | 45 | 0.97 | 78 | 0 |
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| 1930 | 35.4 | 35 | 48 | 22 | 23 | 53 | 0.29 | 106 | 1 |
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| 1929 | 36.6 | 27 | 46.6 | 30 | 26.7 | 20 | 1.09 | 74 | 0 |
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| 1928 | 36.4 | 28 | 48.4 | 19 | 24.5 | 38 | 1.55 | 44 | 0 |
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| 1927 | 35.9 | 32 | 46 | 37 | 26.3 | 21 | 1.70 | 35 | 2 |
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| 1926 | 30.2 | 73 | 41.4 | 64 | 19.1 | 85 | 0.72 | 92 | 1 |
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| 1925 | 38.4 | 16 | 52.4 | 6 | 24.2 | 41 | 0.74 | 90 | 1 |
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| 1924 | 30.2 | 73 | 37.9 | 87 | 22.4 | 59 | 2.45 | 21 | 0 |
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| 1923 | 26 | 99 | 38.2 | 85 | 13.9 | 106 | 1.65 | 38 | 0 |
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| 1922 | 36.3 | 30 | 47.2 | 29 | 25.4 | 32 | 0.76 | 89 | 0 |
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| 1921 | 39.3 | 10 | 51.4 | 11 | 27.2 | 14 | 0.93 | 81 | 0 |
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| 1920 | 34.1 | 45 | 46.2 | 34 | 21.9 | 63 | 3.20 | 10 | 0 |
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| 1919 | 34.3 | 43 | 45.6 | 39 | 23.1 | 52 | 0.81 | 87 | 0 |
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| 1915 | 27.6 | 90 | 35.9 | 93 | 19.3 | 82 | 0.70 | 94 | 0 |
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| 1914 | 31.9 | 65 | 42.3 | 56 | 21.5 | 68 | 1.39 | 57 | 0 |
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| 1913 | 29.3 | 78 | 41.8 | 61 | 16.7 | 97 | 1.75 | 32 | 0 |
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| 1912 | 24.6 | 105 | 35.3 | 97 | 13.7 | 108 | 1.75 | 32 | 1 |
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| 1900 | 28.1 | 86 | 38.5 | 82 | 17.7 | 93 | 1.00 | 77 | 2 |
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| 1899 | 17.7 | 111 | 27.4 | 113 | 8 | 112 | 1.29 | 61 | 0 |
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| 1898 | 33.1 | 53 | 45.9 | 38 | 20.7 | 72 | 0.72 | 92 | 3 |
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| 1897 | 25.6 | 102 | 34.9 | 101 | 16.2 | 100 | 1.72 | 34 | 0 |
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| 1896 | | | 36 | 91 | | | 1.15 | 71 | 4 |
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| 1895 | 32.6 | 56 | 47.6 | 25 | 17.7 | 93 | 0.28 | 107 | 2 |
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