Year,Fall_num_tow,Fall_kg_tow,Spring_num_tow,Spring_kg_tow
1963,87.3,24.1,,
1964,116.3,54.6,,
1965,57,13.1,,
1966,91.9,29.1,,
1967,100.5,24.3,,
1968,143.4,40.4,45.2,17
1969,71.2,23.5,46.4,19.7
1970,94,32.9,54.7,18.9
1971,48,23.4,157.2,71.6
1972,55.6,24.6,101.2,44.4
1973,39.2,17,44.4,25.3
1974,48.3,24.2,34.3,18.8
1975,74.8,39.9,38.9,17.6
1976,28.9,15.3,62.2,26.2
1977,40.4,17.3,25.1,11.6
1978,45.2,20.7,24,12.2
1979,28.9,16,61.6,32.3
1980,20.6,12.6,29.8,20.3
1981,20.4,12.2,33.6,18.6
1982,9,3.4,16.9,9.4
1983,10,4.1,9.9,6.1
1984,7.8,3.9,5,2.7
1985,13,5.7,11.7,6.6
1986,26.1,8,5.3,3.2
1987,13.7,5.5,24.5,12.9
1988,12.4,6.3,8.1,3.3
1989,20.3,6.8,7.6,2.9
1990,35.5,12.2,12.3,6.8
1991,19.1,8.4,9.5,4.3
1992,22.4,8.1,37.9,10.7
1993,35.6,11.2,35.5,17.5
1994,20.9,5.9,16.1,3.9
1995,33.2,4.7,7.2,1.9
1996,169.6,30.6,28.7,11.9
1997,65,18.9,212,34
1998,117,31.7,34.7,7.8
1999,82.5,22.9,76.1,19
2000,104.4,26.2,180.1,56
2001,89.8,28.2,101.6,40
2002,185.2,41.9,225.2,61.2
2003,250.9,65.5,109.1,33.3
2004,127.3,36.6,152.3,55.7
2005,166.07,46.95,145.3,46.3