Year	Measure
1995	8.87
1996	9.08
1997	9.35
1998	9.5
1999	9.4
2000	9.4
2001	9
2002	9.3
2003	9.3
2004	9.2
2005	9.2
2006	9.2
2007	9.3
2008	9.3
2009	9.2
2010	9.2
2011	9.29849