Year	Percent
1995	47.56
1996	45.83
1997	46.31
1998	39.48
1999	44.45
2000	43.04
2001	47.44
2002	50.87
2003	48.91
2004	47.47
2005	52.87
2006	53.75
2007	49.15
2008	48.88
2009	60.59
2010	59.89