Year	Measure
1996	3.4
1997	2.05
1998	2.8
1999	2.5
2000	2.7
2001	2
2002	2.2
2003	2.3
2004	2.2
2005	2.5
2006	2.7
2007	2.9
2008	3
2009	2.7
2010	2.8
2011	2.76323