Year	Percent
1995	59.76
1996	57.72
1997	54.46
1998	54.17
1999	55.06
2000	53.88
2001	54.19
2002	53.57
2003	52.27
2004	52.28
2005	54.21
2006	55.76
2007	59.36
2008	62.57
2009	66.44
2010	54.6