Year	%
1995	81.82
1996	74.92
1997	68.2
1998	72.87
1999	75.05
2000	73.76
2001	71.63
2002	71.09
2003	71.72
2004	76.8
2005	76.21
2006	78.51
2007	78.04
2008	77.36
2009	76.78
2010	77.31
2011	77.48
2012	80.23
2013	78.31
2014	82.23
2015	80.45
2016	80.65
2017	22.78