Year	%
1970	55.06254
1971	69.46805
1972	88.50478
1973	88.41413
1974	88.84941
1975	89.01631
1976	92.72167
1977	92.7657
1978	92.12849
1979	93.76834
1980	89.00044
1981	94.4668
1983	89.84488
1984	91.96418
1991	100
1992	99.08433
1993	95.70886
2000	97.87674
2001	97.90624
2002	96.90012
2003	95.21936