Year	Percent
1995	39.87
1996	37.48
1997	43.89
1998	43.75
1999	43.7
2000	43.81
2001	48.65
2002	48.94
2003	46.35
2004	47.17
2005	49.99
2006	52.5
2007	49.64
2008	51.83
2009	50.28
2010	50.88