Year	Percent
1995	57.27
1996	65.82
1997	59.45
1998	63.39
1999	58.51
2000	55.63
2001	58.15
2002	55.88
2003	57.16
2004	58.91
2005	61.44
2006	61.32
2007	62.49
2008	63.37
2009	62.5
2010	61.38