Year	Years
1990	65
1991	64.8
1992	62.6
1993	58.8
1994	63.7
1995	63.6
1996	63.8
1997	64.5
1998	65
1999	65.7
2000	66.3
2001	66.9
2002	67.4
2003	68
2004	68.4
2005	68.8
2006	69
2007	69.2
2008	69.5
2009	69.7
2010	69.9
2011	70.2
2012	70.4
2013	70.6