Year	%
1971	95.94871
1972	91.05839
1973	93.04739
1977	96.72037
1979	94.88592
1980	98.8865
1981	100
1982	100
1983	100
1991	95.54939
1992	93.23713
1995	98.21799
1996	97.5863
1999	69.00006
2007	93.62972
2008	93.90416
2009	95.20744