Year	Percent
1995	38.48
1996	41.72
1997	44.37
1998	49.01
1999	50.17
2000	48.63
2001	54.92
2002	53.71
2003	52.43
2004	52.59
2005	52.91
2006	55.31
2007	55.82
2008	55.95
2009	58.18
2010	58.97