Year	Percent
1995	51.69
1996	52.97
1997	52.59
1998	52.35
1999	51.73
2000	54.93
2001	53.75
2002	52.65
2003	52.71
2004	51.84
2005	51.53
2006	52.4
2007	52.37
2008	54.09
2009	54.88
2010	54.3