Year	%
1995	77.86
1996	71.4
1997	70.27
1998	72.66
1999	75.59
2000	71.19
2001	67.43
2002	69.03
2003	67.47
2004	68.35
2005	71.81
2006	72.61
2007	72.79
2008	72.43
2009	73.16
2010	72.33
2011	73.27
2012	78.92
2013	72.83
2014	77.13
2015	75.46
2016	78.12
2017	31.08