Year	Percent
1995	62.62
1996	65.25
1997	65.69
1998	67.11
1999	67.56
2000	66.02
2001	66.12
2002	67.84
2003	67.97
2004	67.12
2005	67.07
2006	66.11
2007	65.74
2008	65.09
2009	67.84
2010	68.15