Year	Percent
1995	15.21
1996	15.38
1997	17.41
1998	18.93
1999	16.69
2000	17.83
2001	19.12
2002	17.83
2003	17.94
2004	18.82
2005	19.15
2006	18.03
2007	17.87
2008	15.2
2009	15.68
2010	13.55