Year	Percent
1995	20.9
1996	23.2
1997	26.33
1998	30.83
1999	33.77
2000	34.54
2001	31.08
2002	32.27
2003	33.06
2004	28.68
2005	31.58
2006	36.97
2007	35.95
2008	37.05
2009	41.4
2010	43.35