Year	Percent
1995	57.1
1996	56.59
1997	54.95
1998	52.29
1999	56.35
2000	56.29
2001	57.41
2002	59.88
2003	65.03
2004	60.29
2005	61.43
2006	64.47
2007	62.84
2008	64.32
2009	66.46
2010	63.66