Year	Percent
1995	13.56
1996	13.5
1997	13.35
1998	13.37
1999	13.35
2000	13.41
2001	14.07
2002	14.82
2003	15.67
2004	15.71
2005	15.76
2006	15.85
2007	16.05
2008	16.51
2009	17.61
2010	17.89