Year	Years
1990	61.3
1991	61.6
1992	61.8
1993	62
1994	62.6
1995	62.8
1996	62.9
1997	63.2
1998	63.4
1999	64.1
2000	64.4
2001	64.7
2002	65.2
2003	65.3
2004	65.6
2005	66.3
2006	66.6
2007	67
2008	67.4
2009	67.6
2010	68
2011	68.2
2012	68.6
2013	68.9