Year	Percent
1995	38.23
1996	37.85
1997	37.76
1998	35.53
1999	35
2000	35.62
2001	33.6
2002	33.56
2003	25.42
2004	20.36
2005	21.73
2006	20.76
2007	25.01
2008	25.12
2009	22.53
2010	23.77