Year	Measure
1995	2.66
1996	2.5
1997	2.77
1998	2.3
1999	2.6
2000	2.7
2001	2.8
2002	2.5
2003	2.4
2004	2.3
2005	2.3
2006	2.3
2007	2
2008	1.9
2009	1.9
2010	2
2011	1.8895