Year	Percent
1995	70.78
1996	70.58
1997	70.85
1998	70.35
1999	70.75
2000	72.51
2001	74.65
2002	74.5
2003	74.49
2004	75.96
2005	76.2
2006	76.58
2007	76.55
2008	77.51
2009	77.88
2010	77.62