Year	Years
1990	62.6
1991	62.6
1992	62.6
1993	62.6
1994	62.8
1995	62.8
1996	62.9
1997	62.1
1998	63
1999	62.6
2000	63
2001	63
2002	63
2003	63
2004	63.1
2005	63.1
2006	63.3
2007	63.4
2008	63.6
2009	63.8
2010	64
2011	64.2
2012	64.4
2013	64.6