Year	%
1976	84.29119
1977	86.52038
1978	62.00814
1993	89.51542
1997	94.94058
1998	93.53124
1999	93.34989
2000	93.50852
2003	94.38107
2004	98.5018
2005	96.56757
2006	97.85004
2007	98.25157
2008	98.17039
2009	98.61367
2010	99.60323
2011	98.88238
2012	96.28662
2013	99.0069
2016	99.58045