Year,Fall_kg_tow,Spring_kg_tow,Winter_kg_tow
1963,14.02,,
1964,13.97,,
1965,10.23,,
1966,9.03,,
1967,14.02,,
1968,13.04,18.65,
1969,14.47,14.31,
1970,16.21,12.07,
1971,8.98,9.55,
1972,31.54,10.82,
1973,3.13,12.12,
1974,1.55,4.92,
1975,0.60,1.31,
1976,1.95,1.67,
1977,1.13,1.96,
1978,2.00,3.51,
1979,1.82,1.32,
1980,1.35,4.83,
1981,4.05,6.93,
1982,5.71,5.87,
1983,4.49,4.10,
1984,1.03,1.30,
1985,0.30,0.95,
1986,0.75,1.05,
1987,0.40,0.32,
1988,0.51,0.38,
1989,2.36,2.09,
1990,1.31,5.06,
1991,0.76,2.51,
1992,0.15,0.79,5.26
1993,0.12,0.34,2.12
1994,0.31,0.14,3.92
1995,0.30,0.33,3.46
1996,0.21,0.75,3.35
1997,0.85,0.79,5.72
1998,0.66,0.85,2.78
1999,0.47,1.14,5.23
2000,0.72,0.99,3.03
2001,0.42,0.66,4.79
2002,1.09,0.51,2.59
2003,0.43,0.17,1.54
2004,0.10,0.23,0.83
2005,0.50,0.22,0.95