Year	Percent
1995	48.33
1996	57.31
1997	51.99
1998	49.88
1999	49.34
2000	51.82
2001	59.48
2002	60.9
2003	58.18
2004	59.23
2005	58.9
2006	59.58
2007	60.18
2008	62.41
2009	47.63
2010	63.24
2011	62.05
2012	61.53
2013	61.08
2014	61.24
2015	62.19
2016	62.09
2017	62.19