Year	Measure
1996	2.21
1998	2.5
1999	2
2000	2.1
2001	2
2002	1.9
2003	1.9
2004	2.1
2005	2.1
2006	2.2
2007	2.1
2008	2.1
2009	2.2
2010	2.1
2011	2.24349