Year	Percent
1995	57.19
1996	59.94
1997	56.48
1998	58.55
1999	60.17
2000	56.62
2001	54.55
2002	55.36
2003	50.52
2004	55.65
2005	53.05
2006	41.12
2007	35.86
2008	38.3
2009	33.86
2010	32.68