Year	Measure
1998	2.8
1999	2.6
2000	1.5
2001	2.1
2002	2.4
2003	2.3
2004	2.2
2005	2.6
2006	2.8
2007	2.7
2008	2.5
2009	2.2
2010	2.4
2011	2.29688