Year	Percent
1995	46.4
1996	50.64
1997	52.84
1998	54.85
1999	55.85
2000	58.98
2001	59.97
2002	57.72
2003	55.87
2004	53.64
2005	52.21
2006	49.31
2007	44.05
2008	40.42
2009	37.46
2010	36.59