Year	Years
1990	70.9
1991	70.9
1992	71.3
1993	71.9
1994	72.3
1995	72.6
1996	72.8
1997	72.8
1998	72.8
1999	73
2000	73.3
2001	73.7
2002	73.8
2003	73.9
2004	74.2
2005	74.3
2006	74.4
2007	74.5
2008	74.8
2009	75.1
2010	75.5
2011	75.9
2012	76.1
2013	76.2