Year	Years
1990	70.7
1991	71.1
1992	71.4
1993	71.7
1994	72
1995	72.3
1996	72.6
1997	72.9
1998	73.2
1999	73.4
2000	73.7
2001	73.9
2002	74
2003	74.1
2004	74.2
2005	74.3
2006	74.3
2007	74.3
2008	74.6
2009	74.8
2010	75
2011	75.2
2012	75.4
2013	75.5