Year	Years
1990	69.7
1991	70
1992	70.4
1993	70.8
1994	71.2
1995	71.7
1996	72.1
1997	72.5
1998	73
1999	73.4
2000	73.8
2001	74.2
2002	74.6
2003	75
2004	75.4
2005	75.8
2006	76.1
2007	76.4
2008	76.6
2009	76.7
2010	76.7
2011	75.1
2012	73.5
2013	72.4