Year	Percent
1995	76.5
1996	76.16
1997	75.43
1998	76.11
1999	76.28
2000	76.83
2001	75.31
2002	74.63
2003	74.11
2004	72.11
2005	70.27
2006	68.99
2007	67.27
2008	66.88
2009	67.41
2010	68.1