Year	Percent
1995	13.72
1996	13.93
1997	12.79
1998	14.06
1999	14.57
2000	14.93
2001	15.28
2002	16.01
2003	15.43
2004	15.38
2005	15.57
2006	15.8
2007	18.48
2008	20.78
2009	15.86
2010	14.28