Year,Spring_kg_tow,Fall_kg_tow
1963,,
1964,,
1965,,
1966,,
1967,,
1968,,
1969,,
1970,,
1971,,
1972,,
1973,,
1974,,
1975,,
1976,,
1977,,
1978,18.3727,11.7496
1979,14.407,28.9783
1980,17.4941,15.9398
1981,28.3704,13.2277
1982,14.6871,23.635
1983,27.2334,15.7715
1984,15.9767,10.8172
1985,13.5938,7.53673
1986,14.724,6.81975
1987,17.6478,7.73743
1988,10.6165,7.25382
1989,13.3172,7.46157
1990,12.9657,13.4516
1991,11.5867,16.1755
1992,13.9382,13.4714
1993,12.3902,14.9956
1994,10.0356,13.5604
1995,14.5599,17.2753
1996,12.8227,13.0313
1997,14.7957,15.0823
1998,15.7562,14.9343
1999,14.1978,23.0774
2000,35.453,25.6933
2001,23.8909,18.3666
2002,21.4044,18.4006
2003,17.7175,16.8025
2004,12.2151,16.1937
2005,13.7441,12.415