Year	Years
1990	70.1
1991	69.2
1992	67.9
1993	66.5
1994	65.8
1995	66.4
1996	67.9
1997	69
1998	69.6
1999	69.9
2000	70.1
2001	70.2
2002	70.4
2003	70.8
2004	71
2005	70.9
2006	70.9
2007	71.3
2008	72.3
2009	73.2
2010	74
2011	74.7
2012	75.1
2013	75.3