Year	Percent
1995	45.8
1996	47.08
1997	47.18
1998	42.85
1999	44.66
2000	42.63
2001	45.39
2002	47.11
2003	46.94
2004	43.85
2005	43.34
2006	42.96
2007	41.92
2008	43.67
2009	44.37
2010	44.86