Year	Percent
1995	70.3
1996	74.98
1997	72.35
1998	70.17
1999	67.16
2000	61.65
2001	62.74
2002	67.3
2003	74.66
2004	64.17
2005	67.86
2006	63.1
2007	57.72
2008	56.15
2009	62.09
2010	59.21