Year	Measure
1998	4.1
1999	4.1
2000	4.1
2001	3.2
2002	2.9
2003	2.8
2004	2.8
2005	2.8
2006	2.7
2007	2.7
2008	2.8
2009	3.3
2010	3.4
2011	3.00229