Year	Percent
1995	71.04
1996	66.18
1997	67.82
1998	64.15
1999	62.71
2000	63.08
2001	62.81
2002	62.46
2003	61.17
2004	59.83
2005	60.5
2006	75.63
2007	75.2
2008	75.3
2009	79.04
2010	79.23