Year	Percent
1995	35.96
1996	41.71
1997	39.22
1998	44.88
1999	44.61
2000	39.88
2001	34.86
2002	33.19
2003	33.11
2004	34.8
2005	37.95
2006	41.07
2007	40.45
2008	40.92
2009	39.01
2010	36.41