Year	Percent
1995	70.99
1996	72.36
1997	71.35
1998	72.44
1999	73.33
2000	68.92
2001	56.26
2002	58.01
2003	57.06
2004	49.55
2005	48.91
2006	43.46
2007	54.38
2008	54.57
2009	54.97
2010	58.38