Year	Measure
1996	5.57
1997	5.08
1998	4.6
1999	4.2
2000	4.1
2001	4.1
2002	4
2003	3.6
2004	3.5
2005	3.4
2006	3.7
2007	4.2
2008	4.6
2009	5
2010	5.3
2011	5.48242