Year	Years
1990	66.2
1991	68
1992	68.4
1993	68.6
1994	69
1995	69.3
1996	69.7
1997	69.9
1998	70.4
1999	70.8
2000	71.2
2001	71.6
2002	72.2
2003	72
2004	73.8
2005	74.5
2006	75.4
2007	76.2
2008	76.9
2009	77.5
2010	77.9
2011	78.1
2012	78.2
2013	78.3