Year	Percent
1995	56.47
1996	56.61
1997	56.47
1998	57.09
1999	52.37
2000	47.97
2001	41.15
2002	47.19
2003	50.88
2004	53.07
2005	52.25
2006	50.22
2007	52.67
2008	54.88
2009	50.82
2010	55.03