Year	Percent
1995	46.44
1996	45.53
1997	45.05
1998	45.34
1999	44.86
2000	44.57
2001	43.07
2002	42.26
2003	41.65
2004	41.61
2005	40.54
2006	40.88
2007	40.73
2008	40.5
2009	40.28
2010	40.98