Year	Years
1990	60.4
1991	60.4
1992	60.6
1993	60.7
1994	60.9
1995	61.1
1996	61.3
1997	61.4
1998	61.6
1999	61.7
2000	61.7
2001	61.7
2002	61.8
2003	61.8
2004	61.9
2005	62
2006	62.2
2007	62.2
2008	62.6
2009	62.7
2010	63
2011	63.3
2012	63.5
2013	63.7