Year	Percent
1995	42.9
1996	43.41
1997	45.05
1998	47.71
1999	43.65
2000	43.71
2001	42.59
2002	40.12
2003	34.97
2004	39.71
2005	38.57
2006	35.53
2007	37.16
2008	35.68
2009	33.54
2010	36.34