Year	Percent
1995	51.29793
1996	51.87134
1997	51.26652
1998	52.72531
1999	55.24109
2000	56.99271
2001	57.09922
2002	57.94311
2003	57.36786
2004	56.74486
2005	56.58007
2006	56.40147
2007	56.73389
2008	57.29376
2009	62.62958
2010	60.81172
2011	58.60387
2012	58.61193
2013	59.81075
2014	59.5082
2015	59.89442
2016	61.16058
2017	60.2958