Year	Percent
1995	36.18
1996	35.65
1997	33.98
1998	38.78
1999	41.86
2000	39.9
2001	40.68
2002	37.18
2003	39.91
2004	37.44
2005	33.81
2006	30.11
2007	31.84
2008	34.85
2009	35.44
2010	37.16