Year	Percent
1995	66.27
1996	57.77
1997	55.77
1998	59.24
1999	58.35
2000	54.39
2001	51.21
2002	52.14
2003	52.82
2004	56.58
2005	57.06
2006	64.09
2007	60.74
2008	62.47
2009	61.65
2010	61.14