Year	Years
1990	72.9
1991	73.2
1992	73.4
1993	73.4
1994	73.4
1995	73.5
1996	73.6
1997	73.8
1998	74.1
1999	74.3
2000	74.6
2001	74.9
2002	75
2003	75
2004	75.2
2005	75.4
2006	75.5
2007	75.7
2008	76
2009	76.3
2010	76.5
2011	76.6
2012	76.7
2013	76.9