Year	Percent
1995	39.7
1996	30.7
1997	37.4
1998	33.26
1999	38.39
2000	41.42
2001	38.77
2002	41.16
2003	39.82
2004	37.97
2005	35.31
2006	35.43
2007	34.21
2008	33.28
2009	34.19
2010	35.38