Year	Years
1990	68.3
1991	68.7
1992	69
1993	69.3
1994	69.6
1995	69.7
1996	70.1
1997	70.4
1998	70.7
1999	71
2000	71.3
2001	71.5
2002	71.8
2003	72
2004	72.2
2005	72.5
2006	72.8
2007	73
2008	73.3
2009	73.5
2010	73.7
2011	73.9
2012	74.1
2013	74.3