Year	Years
1990	69.7
1991	69.7
1992	69.7
1993	69.7
1994	69.6
1995	69.6
1996	69.6
1997	69.6
1998	69.6
1999	69.7
2000	69.8
2001	70
2002	70.1
2003	70.3
2004	70.5
2005	70.7
2006	70.9
2007	71.2
2008	71.6
2009	72.1
2010	72.3
2011	72.4
2012	72.6
2013	72.7