Year	Percent
1995	82.71
1996	82.58
1997	79.38
1998	76.98
1999	80.44
2000	78.28
2001	71.42
2002	71.84
2003	73.46
2004	70.86
2005	68.62
2006	62.67
2007	66.48
2008	62.88
2009	61.9
2010	65.41