Year	Percent
1995	16.14
1996	17.06
1997	19.73
1998	19.73
1999	19.46
2000	20.8
2001	20.12
2002	20.19
2003	19.97
2004	18.66
2005	18.12
2006	18.73
2007	18.66
2008	17.65
2009	15.85
2010	16.11