Year	Years
1990	64.6
1991	65.2
1992	65.8
1993	66.3
1994	66.8
1995	67.2
1996	67.6
1997	68
1998	68.3
1999	68.6
2000	68.9
2001	69.1
2002	69.3
2003	69.4
2004	69.6
2005	69.8
2006	70
2007	70.1
2008	70.1
2009	70.2
2010	70.3
2011	70.5
2012	70.7
2013	70.9