Year	Percent
1995	33.64
1996	34
1997	33.85
1998	33.35
1999	33.6
2000	35.78
2001	35.64
2002	36.3
2003	36.42
2004	36.58
2005	43.98
2006	49.84
2007	56.52
2008	58.66
2009	55.82
2010	51.74