Year	Years
1990	70.9
1991	71.4
1992	71.6
1993	72
1994	72.3
1995	72.5
1996	72.8
1997	73.1
1998	71.6
1999	73.6
2000	73.9
2001	74.1
2002	74.2
2003	74.3
2004	74.4
2005	74.6
2006	74.8
2007	75
2008	75.2
2009	75.5
2010	75.8
2011	76
2012	76.2
2013	76.4