Year	Percent
1995	47.9
1996	37.27
1997	42.18
1998	43.13
1999	42.78
2000	47.63
2001	52.68
2002	49.27
2003	47.19
2004	46.21
2005	45.95
2006	45.57
2007	45.28
2008	50.55
2009	47.7
2010	48.24