Year	Years
1990	64.9
1991	65
1992	65.3
1993	65.4
1994	65.2
1995	64.8
1996	64.6
1997	64.4
1998	64.4
1999	64.5
2000	64.4
2001	64.2
2002	63.7
2003	63
2004	62.6
2005	62.6
2006	63
2007	63.1
2008	63
2009	63.1
2010	63.3
2011	63.5
2012	63.8
2013	64