Year	Percent
1994	39.96385
1995	46.29051
1996	63.94773
1997	55.68139
1998	45.50012
1999	37.15205
2000	40.07158
2001	48.43285
2002	50.97053
2003	57.7699
2004	63.77377
2005	58.81527
2006	57.68332
2007	64.40112
2008	66.24499
2009	58.64788
2010	51.82573
2011	51.67383
2012	44.85474
2013	43.5739
2014	38.84753
2015	32.88303
2016	30.56619
2017	46.18446