Year	Measure
1998	5
1999	4.9
2000	4.7
2001	4.5
2002	4.5
2003	4.4
2004	4.1
2005	4.2
2006	5.1
2007	4.7
2008	5.5
2009	5.4
2010	5.4
2011	5.06715