Year	%
1995	60.1
1996	49.62
1997	42.24
1998	62.44
1999	64.72
2000	51.79
2001	51.79
2002	55.29
2003	51.92
2004	45.79
2005	45.79
2006	45.78
2007	48.84
2008	45.74
2009	45.75
2010	45.75
2011	46.17
2012	46.95
2013	48.44
2014	40.06
2015	46.95
2016	48.55
2017	31.72