Year	Percent
1995	44.91
1996	44.97
1997	44.67
1998	43.51
1999	43.06
2000	43.2
2001	44.16
2002	44.1
2003	43.6
2004	44
2005	44.08
2006	44.88
2007	45.12
2008	46.04
2009	47.67
2010	53.06