Year	Percent
1995	84.01
1996	74.4
1997	76.27
1998	81.85
1999	81.81
2000	79.56
2001	76.5
2002	73.71
2003	71.92
2004	71.31
2005	79.47
2006	74.96
2007	67.68
2008	67.42
2009	63.36
2010	62.77