Year,Fall_kg_tow,Summer_kg_tow
1968,3.2000,
1969,2.7000,
1970,3.7000,
1971,3.0000,
1972,3.3000,
1973,1.9000,
1974,0.8000,
1975,0.9000,
1976,0.6000,
1977,0.2000,
1978,0.4000,
1979,0.5000,
1980,0.5000,
1981,1.5000,
1982,0.3000,
1983,1.0000,
1984,1.9000,10.4700
1985,1.6000,17.6900
1986,2.5000,19.6100
1987,1.7000,15.4000
1988,1.2000,12.7600
1989,1.8000,16.9500
1990,2.0000,18.1200
1991,0.9000,11.6800
1992,0.6000,9.4300
1993,1.6000,9.1400
1994,2.2000,8.6900
1995,1.8000,13.2900
1996,1.1000,8.7700
1997,1.3000,7.7300
1998,2.3000,6.3300
1999,2.5400,5.7800
2000,1.2800,6.3900
2001,0.8700,4.3300
2002,0.1700,9.1600
2003,0.9500,5.4500
2004,0.8300,10.2300
2005,1.8400,23.2900
2006,2.8000,65.9500