Year	Percent
1995	12.09
1996	12.5
1997	12.77
1998	12.87
1999	13.2
2000	13.18
2001	13.34
2002	13.28
2003	14.95
2004	14.86
2005	15.21
2006	15.52
2007	15.46
2008	15.69
2009	15.22
2010	15.22