Year	%
1971	85.75766
1972	76.43676
1973	82.58536
1974	93.43187
1975	98.7474
1976	91.64358
1977	95.32957
1979	82.87002
1982	65.52519
1984	70.56039
1985	65.44159
1986	64.3893
1987	64.10999
1988	62.98938
1999	66.79382