Year	Years
1990	68.4
1991	68.5
1992	68.8
1993	68.9
1994	69
1995	69.2
1996	69.3
1997	69.5
1998	69.6
1999	69.7
2000	69.9
2001	70.1
2002	70.3
2003	70.5
2004	70.7
2005	70.8
2006	71.1
2007	71.3
2008	71.4
2009	69.9
2010	71.6
2011	71.6
2012	71.6
2013	71.8