Year	Years
1990	58.1
1991	58.4
1992	58.6
1993	59
1994	59.3
1995	59.6
1996	60
1997	60.4
1998	60.7
1999	61.1
2000	61.4
2001	61.8
2002	62.1
2003	62.6
2004	63.1
2005	63.5
2006	64.1
2007	64.7
2008	60.8
2009	65.6
2010	66
2011	66.4
2012	66.7
2013	67.1