Year	Percent
1995	17.84
1996	18.41
1997	18.45
1998	19.42
1999	20.62
2000	20.44
2001	20.22
2002	18.13
2003	14.95
2004	14.71
2005	14.4
2006	13.79
2007	13.64
2008	13.64
2009	13.64
2010	13.64