Year	Years
1990	68.7
1991	68.8
1992	68.9
1993	69
1994	69.1
1995	69.2
1996	69.2
1997	69.3
1998	69.2
1999	69.2
2000	69.1
2001	69.1
2002	69.1
2003	69.2
2004	69.3
2005	69.5
2006	69.7
2007	69.8
2008	69.9
2009	69.8
2010	70.1
2011	70.1
2012	70.2
2013	70.3