Year	Percent
1995	57.87
1996	58.59
1997	55.29
1998	53.98
1999	52.19
2000	53.44
2001	55.19
2002	56.16
2003	55.83
2004	54.84
2005	54.97
2006	54.78
2007	54.6
2008	53.02
2009	51.66