Year	Years
1990	69.1
1991	69.5
1992	69.7
1993	69.7
1994	70
1995	70.2
1996	70.5
1997	71
1998	71.2
1999	71.5
2000	71.9
2001	72.2
2002	72.5
2003	72.7
2004	73
2005	73.4
2006	73.7
2007	73.8
2008	73.9
2009	74
2010	74.2
2011	74.5
2012	74.7
2013	75