Year	Percent
1995	89.77
1996	88.37
1997	89.17
1998	86.35
1999	72.39
2000	67.77
2001	69.11
2002	67.33
2003	68.24
2004	66.77
2005	76.96
2006	73.66
2007	76.45
2008	79.03
2009	78.36
2010	78.68