Year	%
1995	79.57
1996	65.72
1997	73.37
1998	66.68
1999	77.43
2000	77.42
2001	80.24
2002	80.92
2003	77.16
2004	77.15
2005	82.37
2006	81.3
2007	82.72
2008	82.7
2009	87.35
2010	83.94
2011	82.6
2012	83.35
2013	82.7
2014	94.31
2015	84.39
2016	95.11
2017	51.48