Year	Percent
1995	35.78
1996	32.67
1997	40.02
1998	42.88
1999	46.15
2000	44.04
2001	41.76
2002	40.35
2003	38.7
2004	38.57
2005	37.5
2006	36.28
2007	34.65
2008	39.44
2009	41.96
2010	40.5