Year	Percent
1995	39.81
1996	38.43
1997	40.74
1998	40.77
1999	41.05
2000	41.04
2001	38.99
2002	40.19
2003	38.34
2004	43
2005	47.97
2006	44.15
2007	45.3
2008	44.8
2009	44.29
2010	44.49