Year	Measure
1995	4.35
1996	4.31
1997	5.9
1998	6.1
1999	6.6
2000	7
2001	7
2002	7.1
2003	6.9
2004	7.1
2005	7
2006	6.8
2007	6.7
2008	6.5
2009	6.1
2010	6.1
2011	6.2296