Year	Percent
1995	38.74
1996	38.37
1997	41.06
1998	39.92
1999	41.19
2000	39.65
2001	37.38
2002	43.91
2003	46.43
2004	53.68
2005	59.54
2006	56.86
2007	60.27
2008	59.05
2009	49.73
2010	50.97