Year	Percent
1995	55.24
1996	52.59
1997	51.46
1998	51.46
1999	57.6
2000	58.36
2001	56.31
2002	55.97
2003	54.18
2004	56.53
2005	55.79
2006	53.63
2007	55.39
2008	53.69
2009	58.88
2010	59.87