Year	Percent
1995	67.96
1996	64.44
1997	68.47
1998	66.71
1999	66.28
2000	68.07
2001	67.08
2002	69.05
2003	66.37
2004	70.35
2005	69.56
2006	67.43
2007	64.2
2008	69.13
2009	74.77
2010	75.1