Year	Years
1990	60.1
1991	60.4
1992	60.8
1993	61
1994	61.2
1995	61.7
1996	61.9
1997	62.3
1998	62.7
1999	63.1
2000	63.5
2001	63.8
2002	64.1
2003	64.5
2004	64.7
2005	65
2006	65.4
2007	65.5
2008	65.9
2009	66.2
2010	66.5
2011	66.5
2012	66.7
2013	67