Year	Years
1990	65.3
1991	65.1
1992	64.8
1993	64.5
1994	64.1
1995	64.1
1996	64.3
1997	64.7
1998	65.1
1999	65.5
2000	65.8
2001	66.1
2002	66.3
2003	66.3
2004	66.4
2005	66.4
2006	66.5
2007	66.7
2008	67.1
2009	67.5
2010	67.8
2011	68.2
2012	68.4
2013	68.6