Year	Measure
1995	9.26
1996	8.8
1997	8.66
1998	9.1
1999	9.1
2000	9.1
2001	9.2
2002	9.3
2003	9.4
2004	9.3
2005	9.4
2006	9.4
2007	9.3
2008	9.2
2009	9.2
2010	9.3
2011	9.16684