Year	Years
1990	70.9
1991	70.9
1992	71
1993	71.1
1994	71.3
1995	71.6
1996	71.8
1997	72.1
1998	72.2
1999	72.3
2000	72.5
2001	72.7
2002	72.9
2003	73.4
2004	73.7
2005	74.1
2006	74.5
2007	74.9
2008	75.1
2009	75.3
2010	75.3
2011	75.4
2012	75.5
2013	75.6