Year	Years
1990	63
1991	62.7
1992	62.3
1993	61.7
1994	61.1
1995	60.3
1996	59.6
1997	58.8
1998	58.1
1999	57.6
2000	57.4
2001	57.3
2002	57.4
2003	57.8
2004	58.2
2005	58.8
2006	59.6
2007	60.6
2008	61.5
2009	62.2
2010	63.1
2011	63.9
2012	64.5
2013	65.2