Year	Percent
1995	46.56
1996	46.11
1997	47.16
1998	48.16
1999	47.91
2000	46.55
2001	41.78
2002	44.68
2003	44.41
2004	44.71
2005	45.62
2006	43.14
2007	40.64
2008	40.3
2009	40.5
2010	38.25