Year	Percent
1985	44.24729
1986	47.25984
1987	41.34462
1988	38.11325
1989	32.76359
1990	29.76504
1991	42.85714
1992	36.84211
1993	46.93878
1994	61.2594
1995	60.28518
1996	67.82068
1997	60.75774
1998	55.15729
1999	72.71737
2000	72.12295
2001	64.88381