Year	Percent
1995	72.52
1996	71.54
1997	74.93
1998	74.68
1999	75.26
2000	75.07
2001	75.73
2002	76.28
2003	76.48
2004	77.36
2005	76.96
2006	76.79
2007	76.88
2008	76.7
2009	74.91
2010	69.16