Year	Percent
1995	15.21
1996	15.65
1997	15.46
1998	15.45
1999	15.15
2000	15.31
2001	16.05
2002	16.2
2003	16.45
2004	15.98
2005	15.73
2006	15.85
2007	15.43
2008	14.67
2009	14.46
2010	14.56