Year	Percent
1994	21.58931
1995	26.74566
1996	37.62726
1997	41.45021
1999	37.1428
2000	39.2024
2001	39.76679
2002	41.36517
2003	47.30976
2004	56.2455
2005	65.07338
2006	63.74797
2007	60.32932
2008	59.76608
2009	60.84116
2010	50.74002
2011	48.94032
2012	45.54545
2013	43.12321
2015	45.43136