Year	Measure
1997	2.79
1998	2.5
1999	2.6
2000	2.5
2001	2.6
2002	2.4
2003	2.4
2004	2.6
2005	2.6
2006	2.6
2007	2.6
2008	2.7
2009	2.7
2010	2.7
2011	2.86438