Year	Measure
1995	2.79
1996	3.33
1997	3.06
1998	3
1999	3.2
2000	3.2
2001	3.2
2002	3.2
2003	3.3
2004	3.6
2005	3.8
2006	3.6
2007	3.3
2008	3.5
2009	3.4
2010	3.5
2011	3.381