Year	%
1971	88.18455
1972	94.16545
1973	95.19124
1974	94.37381
1975	95.69829
1976	95.07193
1977	95.73913
1978	95.74843
1979	94.88461
1980	94.47803
1981	95.08692
1982	94.14974
1986	96.70142
1987	100
1988	94.28283
1992	97.42152
1993	97.90785
1999	98.49405
2002	97.73181
2003	99.66023
2004	98.0445
2005	98.61098
2006	100
2007	100
2010	99.17815
2013	97.63998
2016	98.81545
2017	97.73706