Year	Percent
1995	52.59
1996	60.05
1997	56.19
1998	58.61
1999	50.26
2000	52.63
2001	43.38
2002	57.4
2003	50.55
2004	56.69
2005	48.81
2006	54.73
2007	52.03
2008	53.54
2009	55.37
2010	53.51