Year	Years
1990	72.6
1991	72.7
1992	72.8
1993	73.1
1994	73.4
1995	73.5
1996	73.5
1997	73.6
1998	73.7
1999	74
2000	74.3
2001	74.4
2002	74.3
2003	74.5
2004	75
2005	75.4
2006	75.5
2007	75.4
2008	75.5
2009	75.6
2010	75.8
2011	75.9
2012	75.9
2013	76