Year	Measure
1996	5.37
1997	5.2
1998	4.8
1999	4.6
2000	4.3
2001	3.9
2002	3.7
2003	3.9
2004	4.2
2005	4.3
2006	4.8
2007	5.2
2008	5.2
2009	4.9
2010	4.6
2011	4.36808