Year	Percent
1995	58.06
1996	56.98
1997	54.34
1998	66.29
1999	70.95
2000	78.81
2001	78.63
2002	78.92
2003	77.64
2004	75.84
2005	73.66
2006	74.57
2007	73.04
2008	72.3
2009	67.79
2010	66.51