Year	%
1973	95.27131
1974	95.60314
1976	84.83299
1977	100
1978	100
1979	99.35166
1981	99.93426
1982	98.22564
1983	99.18982
1984	99.36712
1994	100
1998	100
1999	100
2000	99.72336
2001	99.56864
2002	98.41241
2003	100
2004	95.59054
2009	99.93599
2011	98.73769
2012	96.96537
2015	100
2016	97.40751
2017	96.66629