Year	Years
1990	60.4
1991	60.5
1992	60.7
1993	60.9
1994	61
1995	61.2
1996	61.4
1997	61.5
1998	61.5
1999	61.6
2000	61.8
2001	61.9
2002	62.1
2003	62.3
2004	62.4
2005	62.7
2006	63
2007	63.3
2008	63.6
2009	63.9
2010	64.2
2011	64.5
2012	64.8
2013	65.1