Year	%
1977	75.54348
1978	70.2381
1993	89.50749
1997	97.23305
1998	94.27224
1999	93.94585
2000	94.74282
2005	97.61769
2008	100
2009	99.54822
2010	100
2011	100
2012	96.9166
2013	100
2016	100