Year	years
1960	65.939
1961	66.514
1962	66.055
1963	66.461
1964	67.209
1965	67.097
1966	67.306
1967	67.301
1968	67.304
1969	67.139
1970	66.964
1971	67.54
1972	67.162
1973	67.427
1974	67.082
1975	66.461
1976	66.47
1977	66.17
1978	66.031
1979	65.479
1980	65.756
1981	65.588
1982	65.573
1983	65.309
1984	64.811
1985	66.7
1986	67.33
1987	66.6
1988	67
1989	66.8
1990	66.3
1991	65.5
1992	64.9
1993	63.8
1994	63.5
1995	62.9
1996	63
1997	62.9
1998	62.7
1999	62.2
2000	63.4
2001	62.8
2002	62.3
2003	62.7
2004	63.2
2005	62.9
2006	63.6
2007	64.5
2008	64.7
2009	64.7
2010	64.6
2011	64.7
2012	66.6
2013	67.3
2014	67.8
2015	68.6
2016	68.9
2017	69.3
2018	69.2
2019	69.3
2020	67.306
2021	67.298
2022	68.09