Year	Percent
1995	53.2
1996	53.6
1997	54.77
1998	49.75
1999	52.39
2000	51.19
2001	53.94
2002	56.77
2003	56.75
2004	52.29
2005	51.87
2006	51.06
2007	50.65
2008	53.23
2009	53.76
2010	55.25