Year	Percent
1995	12.5
1996	12.45
1997	13.83
1998	14.05
1999	14.44
2000	14.65
2001	14.85
2002	15.01
2003	15.03
2004	14.54
2005	15.74
2006	15.74
2007	16.02
2008	16.22
2009	16.19
2010	16.19