Year	Years
1990	69.4
1991	69.5
1992	69.7
1993	69.9
1994	70.1
1995	70.2
1996	70.3
1997	70.3
1998	70.6
1999	70.8
2000	70.9
2001	71
2002	71.1
2003	71.3
2004	71.5
2005	71.9
2006	72.2
2007	72.4
2008	72.6
2009	72.7
2010	72.8
2011	72.9
2012	73.1
2013	73.3