Year	Percent
1995	53.59
1996	51.13
1997	49.67
1998	49.88
1999	55.42
2000	56.16
2001	53.71
2002	53.47
2003	51.4
2004	54.14
2005	53.2
2006	51.79
2007	53.49
2008	51.85
2009	56.86
2010	57.81