Year	years
1960	65.54811118149829
1961	65.78933959204866
1962	65.20976894637525
1963	66.14215378274582
1964	66.64451790416176
1965	66.77894156877254
1966	67.19107425799649
1967	66.57298615865871
1968	66.68971764337708
1969	66.08379917227214
1970	66.32834414853349
1971	66.37516619232008
1972	66.90529711784967
1973	67.00129391789199
1974	67.29736743788307
1975	66.99968077464499
1976	67.0810929419522
1977	66.90566095656492
1978	66.76435808229559
1979	66.79744125082283
1980	66.32984599854058
1981	66.81940286346124
1982	66.90006199956555
1983	66.74387740608937
1984	66.66984892211141
1985	66.62513386198708
1986	66.91466849976976
1987	66.92749434042193
1988	67.15754393522882
1989	66.91898112320789
1990	66.697627241066
1991	66.57005623827494
1992	66.65960079768712
1993	66.77586769434858
1994	66.74353810367363
1995	66.88651225270297
1996	67.30491673763252
1997	67.50127092605065
1998	67.91368388496808
1999	68.22691162126159
2000	68.86135820369286
2001	69.26376435394825
2002	69.35698569710627
2003	69.51042642135656
2004	69.8584014491854
2005	69.9452288965537
2006	70.19959456346709
2007	70.39310452470669
2008	70.73539176656583
2009	71.11155015609307
2010	71.50614664262112
2011	72.07754922861001
2012	72.25527765029646
2013	72.69825881723621
2014	73.02671289331484
2015	72.96259175588953
2016	73.31106173567235
2017	73.35179482566346
2018	73.3628914039973
2019	73.70442794790343
2020	72.38457412542137
2021	71.15824621187451
2022	73.20829237885181