Year	Percent
1995	59.11
1996	61.89
1997	60.59
1998	66.09
1999	69.98
2000	72.28
2001	73.85
2002	77.26
2003	79.38
2004	77.38
2005	78.71
2006	76.22
2007	76.13
2008	74.74
2009	78.22
2010	78.55