Year	Percent
1976	84.48967
1977	86.56656
1979	93.49478
1980	89.48475
1981	92.12459
1984	93.29093
1987	93.49602
1988	96.17055
1989	98.76934
1990	98.75062
1991	96.42639
1993	91.51428
2000	88.99003
2001	84.06247
2002	89.87346
2004	88.2436