Year	Percent
1994	86.39894
1995	71.46787
1996	83.88234
1997	72.79733
1998	98.36341
1999	94.17666
2000	75.50027
2001	75.92642
2002	70.92935
2003	83.16849
2004	77.4968
2005	71.61981
2006	63.01234
2007	56.45869
2008	59.31481
2009	48.73812
2010	51.27267
2011	55.80038
2012	55.85213
2013	54.13387
2014	56.57193
2015	53.23088
2016	52.29265
2017	50.95693