Year	Years
1990	57.7
1991	58
1992	58.3
1993	58.6
1994	59
1995	59.3
1996	59.6
1997	60
1998	60.3
1999	60.7
2000	61.1
2001	61.5
2002	61.9
2003	62.4
2004	62.8
2005	63.2
2006	63.6
2007	64
2008	64.4
2009	64.7
2010	65.1
2011	65.5
2012	65.9
2013	66.2