Year,Avg_num_tow_female,Avg_num_tow_male
1984,5.5773,6.3832
1985,2.4459,3.3896
1986,4.3803,8.1497
1987,4.8582,6.8262
1988,2.8736,4.4416
1989,1.9309,5.7302
1990,4.2282,8.8093
1991,4.7370,11.6055
1992,4.4456,14.3514
1993,6.2008,13.1116
1994,5.7596,13.3939
1995,4.5901,12.5212
1996,6.0823,8.8388
1997,12.7676,25.1429
1998,4.7400,12.0928
1999,4.7884,15.9761
2000,3.6431,8.7070
2001,3.0557,7.5338
2002,0.7402,2.5830
2003,1.1348,2.4690
2004,1.3057,2.8796