Year	Years
1990	69.6
1991	69.4
1992	68
1993	65.2
1994	63.6
1995	64.2
1996	65.9
1997	67.4
1998	67.6
1999	66.2
2000	65.4
2001	65.1
2002	64.9
2003	64.8
2004	65
2005	64.8
2006	66.1
2007	67.2
2008	67.6
2009	68.3
2010	68.7
2011	69.4
2012	70.4
2013	71.3