Year	Percent
1995	61.26
1996	61.63
1997	58.94
1998	60.08
1999	58.81
2000	60.35
2001	62.62
2002	56.09
2003	53.57
2004	46.32
2005	40.46
2006	43.14
2007	39.73
2008	40.95
2009	50.27
2010	49.03