Year	Percent
1995	47.77228
1996	51.23392
1997	55.04263
1998	50.52704
1999	42.39834
2000	44.72864
2001	49.50754
2002	53.01777
2003	51.95623
2004	54.38393
2005	61.0747
2006	65.88392
2007	63.48312
2008	68.71041
2009	53.61938
2010	67.21963
2011	77.54585
2012	80.76293
2013	82.81154
2014	79.02614
2015	76.31642
2016	73.15867
2017	79.29363