Year	Percent
1995	42.13
1996	41.41
1997	44.71
1998	46.02
1999	47.81
2000	46.56
2001	44.81
2002	43.83
2003	44.17
2004	45.16
2005	45.03
2006	45.22
2007	45.4
2008	46.98
2009	48.34