Year	Percent
1995	55.03863
1996	56.438
1997	56.49226
1998	58.25696
1999	62.07026
2000	60.17772
2001	59.63862
2002	59.62987
2003	59.51873
2004	59.57247
2005	59.08319
2006	58.26118
2007	57.67717
2008	60.38509
2009	61.30979
2010	60.2189
2011	58.69075
2012	59.08258
2013	59.45759
2014	59.05149
2015	59.8093
2016	60.54824
2017	60.362