Year	Years
1990	59.3
1991	59.9
1992	60.5
1993	61
1994	61.4
1995	62.1
1996	62.7
1997	63.2
1998	63.7
1999	64.2
2000	63.9
2001	65.1
2002	65.5
2003	65.9
2004	66.3
2005	66.6
2006	66.9
2007	67.3
2008	67.6
2009	67.9
2010	68.3
2011	68.7
2012	69
2013	69.4