Year	Measure
1996	4.89
1998	4.7
1999	4.4
2000	4.6
2001	4.9
2002	4.5
2003	4.6
2004	5.3
2005	5.7
2006	5.3
2007	4.7
2008	5.1
2009	5
2010	4.7
2011	4.48575