Year	Percent
1995	57.45
1996	57.32
1997	54.63
1998	55.6
1999	50.32
2000	48.7
2001	57.02
2002	49.67
2003	51.3
2004	61.9
2005	66.35
2006	56.51
2007	62.36
2008	58.04
2009	56.71
2010	59.49