Year	Years
1990	59
1991	59.5
1992	60.1
1993	60.8
1994	61.5
1995	62
1996	62.5
1997	62.9
1998	63.2
1999	63.3
2000	63.6
2001	64.4
2002	65.1
2003	65.7
2004	66.4
2005	67
2006	67.6
2007	68.1
2008	68.7
2009	69.3
2010	69.8
2011	70.4
2012	70.9
2013	71.4