Year	Percent
1995	40.24
1996	42.28
1997	45.54
1998	45.83
1999	44.94
2000	46.12
2001	45.81
2002	46.43
2003	47.73
2004	47.72
2005	45.79
2006	44.24
2007	40.64
2008	37.43
2009	33.56
2010	45.4