Year	Years
1990	70.3
1991	70.6
1992	70.9
1993	71.3
1994	71.9
1995	72.2
1996	72.5
1997	72.9
1998	73.3
1999	73.6
2000	73.5
2001	73.6
2002	73.5
2003	73.7
2004	73.6
2005	73.7
2006	73.3
2007	73.7
2008	73.5
2009	73.6
2010	74
2011	74.1
2012	74.3
2013	74.6