Year	%
1995	84.4
1996	75.21
1997	77.42
1998	75.57
1999	78.78
2000	78.77
2001	80.1
2002	81.43
2003	79.49
2004	79.48
2005	82.09
2006	81.53
2007	82.23
2008	82.1
2009	84.47
2010	82.85
2011	82.03
2012	81.92
2013	81.6
2014	87.21
2015	82.69
2016	89.14
2017	31.92