Year	Percent
1995	76.87
1996	72.14
1997	76.76
1998	77.81
1999	74.9
2000	76.63
2001	75.99
2002	75.58
2003	75.09
2004	74
2005	72.89
2006	79.28
2007	86.56
2008	88.43
2009	89.85
2010	90.61