Year	Percent
1995	35.84
1996	38.21
1997	38.15
1998	51.26
1999	63.37
2000	59.61
2001	50.3
2002	50.85
2003	55.81
2004	62.36
2005	65.75
2006	65.3
2007	66.39
2008	56.81
2009	50.72
2010	51.15