Year	years
1960	65.42391849653913
1961	65.77770498868381
1962	65.65192195049923
1963	65.85471921399176
1964	66.30559235586037
1965	66.31692861782187
1966	66.4805410198057
1967	66.63559220726773
1968	66.38817355065908
1969	66.41326727348554
1970	66.8133363441343
1971	67.07207688649414
1972	67.26453384954364
1973	67.4228174829903
1974	67.74584971112122
1975	67.89972510160825
1976	68.0985982551557
1977	68.35999361684244
1978	68.47608756682743
1979	68.70810662545996
1980	68.75731980610898
1981	69.12383823259637
1982	69.4876495229797
1983	69.57016618758027
1984	69.75282638778071
1985	69.9779384200225
1986	70.46515834341659
1987	70.70795337862357
1988	70.7862259211089
1989	70.9212887475697
1990	70.94799678056715
1991	71.08539167134384
1992	71.1551823530261
1993	70.9012341133466
1994	70.97979402191118
1995	71.14089212523547
1996	71.70919283680973
1997	72.18525658890462
1998	72.44716311192072
1999	72.48153668109468
2000	72.73622989052208
2001	73.03811729165878
2002	73.19919859367185
2003	73.33666631504232
2004	73.78209644971183
2005	73.92687615705073
2006	74.40324939235353
2007	74.75813871516499
2008	75.00103059150102
2009	75.39709225555326
2010	75.6198660908868
2011	75.98276322141126
2012	76.19396010365253
2013	76.45299057299961
2014	76.70903511205822
2015	76.70394071528516
2016	76.89862797063653
2017	77.07284828880712
2018	77.18055665876828
2019	77.4255063349062
2020	76.31902945671027
2021	76.01477403772512
2022	76.78032250257684