Year	Percent
1995	32.23
1996	34.71
1997	28.81
1998	28.26
1999	28.78
2000	28.6
2001	33.29
2002	30.55
2003	26.15
2004	35.88
2005	34.78
2006	35.21
2007	37.7
2008	37.16
2009	36.05
2010	38.17