Year	Years
1990	71.6
1991	71.8
1992	72.3
1993	72.8
1994	73.1
1995	73.5
1996	73.8
1997	74.1
1998	74.5
1999	74.8
2000	75
2001	75.2
2002	75.4
2003	75.6
2004	75.9
2005	76.3
2006	76.6
2007	76.8
2008	77
2009	77.2
2010	77.4
2011	77.7
2012	78
2013	78.2