Year	Years
1990	58.5
1991	59.1
1992	59.8
1993	60.3
1994	61.1
1995	61.7
1996	62.4
1997	63.1
1998	63.7
1999	64.3
2000	64.9
2001	65.5
2002	65.7
2003	66.4
2004	66.8
2005	67.3
2006	67.8
2007	68.2
2008	68.6
2009	69
2010	69.5
2011	69.9
2012	70.3
2013	70.6