Year	Percent
1976	75.01959
1977	76.56219
1979	82.01201
1980	80.69014
1981	80.5867
1984	84.65574
1987	86.60914
1988	88.17953
1989	90.85348
1990	91.90384
1991	88.44897
1993	86.27501
2000	83.77906
2001	77.67829
2002	83.59181
2004	85.02803