Year	Percent
1995	53.5
1996	58.44
1997	61.3
1998	60.05
1999	59.63
2000	59.53
2001	59.53
2002	59.74
2003	59.63
2004	59.54
2005	59.36
2006	55.82
2007	58.79
2008	57.81
2009	60.51
2010	62.59