Year	Percent
1995	52.1
1996	62.73
1997	57.82
1998	56.87
1999	57.22
2000	52.37
2001	47.32
2002	50.73
2003	52.81
2004	53.79
2005	54.05
2006	54.43
2007	54.72
2008	49.45
2009	52.3
2010	51.76