Year	Percent
1995	12.69
1996	12.75
1997	13
1998	13.56
1999	13.36
2000	14.12
2001	14.85
2002	15.01
2003	12.45
2004	12.91
2005	13.04
2006	14.03
2007	15.93
2008	15.61
2009	16.19
2010	16.34