Year	Years
1990	71.4
1991	71.6
1992	71.8
1993	72.1
1994	72.4
1995	72.7
1996	72.9
1997	73.1
1998	73.2
1999	73.5
2000	73.6
2001	73.8
2002	74.1
2003	74.4
2004	74.8
2005	75.2
2006	75.7
2007	76.4
2008	77.1
2009	77.7
2010	78.2
2011	78.4
2012	78.9
2013	79