Year	Measure
1998	3.3
1999	3.4
2000	3.5
2001	2.9
2002	3.1
2003	3.2
2004	3
2005	3.2
2006	3.3
2007	3.6
2008	3.4
2009	3
2010	2.9
2011	2.87053