Year	Years
1990	64.4
1991	64.5
1992	64.7
1993	64.8
1994	64.9
1995	64.9
1996	65
1997	65
1998	65.1
1999	65.2
2000	65.3
2001	65.5
2002	65.7
2003	65.8
2004	66
2005	66.2
2006	66.5
2007	66.8
2008	67.1
2009	67.4
2010	67.6
2011	67.9
2012	68.2
2013	68.4