Year	Years
1990	70.5
1991	70.8
1992	71.1
1993	71.3
1994	71.5
1995	71.7
1996	72.1
1997	72.4
1998	72.9
1999	73
2000	73.2
2001	73.4
2002	73.6
2003	73.7
2004	74.2
2005	74.5
2006	74.8
2007	75
2008	75.3
2009	75.6
2010	75.9
2011	76.1
2012	76.2
2013	76.3