Year	Percent
1995	47.87
1996	49.22
1997	49.58
1998	43.79
1999	45.28
2000	45.97
2001	52.13
2002	60.02
2003	55.11
2004	59.35
2005	59.87
2006	60.19
2007	60.14
2008	58.41
2009	54.63
2010	54.02