Year	Percent
1995	11.07
1996	13.18
1997	13.08
1998	13
1999	12.78
2000	13.15
2001	13.27
2002	13.69
2003	13.38
2004	13.33
2005	13.39
2006	13.41
2007	13.25
2008	13.88
2009	13.83
2010	13.83