Year	Percent
1995	39.68
1996	35.53
1997	35.44
1998	38.27
1999	38.37
2000	40.45
2001	44.21
2002	45.77
2003	48.25
2004	47.97
2005	50.5
2006	48.54
2007	49.05
2008	46.53
2009	46
2010	46