Year	Percent
1995	56.99
1996	59.46
1997	57.05
1998	57.36
1999	57.27
2000	59.7
2001	57.71
2002	55.36
2003	55.63
2004	52.98
2005	59.86
2006	58.31
2007	58.18
2008	57.24
2009	56.43
2010	52.98