Year	years
1960	71.34069743713613
1961	71.7384098047086
1962	71.70120131260795
1963	72.04019737706702
1964	72.59403648908108
1965	72.67543924418598
1966	72.9885887179833
1967	73.22470451917808
1968	73.23419620206379
1969	73.27148759090468
1970	73.72676541036027
1971	74.0698092239585
1972	74.26770345820297
1973	74.4333233487298
1974	74.79427288447032
1975	75.02856598501657
1976	75.2395819979124
1977	75.63864151519908
1978	75.79210678460339
1979	76.08188004878808
1980	76.06576433172756
1981	76.41052716783713
1982	76.73589499819965
1983	76.78939578393849
1984	76.98976278702618
1985	77.10626683166868
1986	77.4247014480898
1987	77.6676685077239
1988	77.7942749658928
1989	77.98530432351954
1990	78.14788720764854
1991	78.2357748963448
1992	78.23287900786517
1993	78.16616005809396
1994	78.49455809849813
1995	78.50195844909841
1996	78.85140619874471
1997	79.14719868315322
1998	79.33051323139023
1999	79.32980799701009
2000	79.53370262209049
2001	79.76580957658258
2002	79.85695378848268
2003	79.93343289791484
2004	80.37530049447791
2005	80.47447950240561
2006	80.8510969256463
2007	81.11650228891872
2008	81.25767726615385
2009	81.56212539789892
2010	81.71322815815516
2011	82.02494287450375
2012	82.1135428044083
2013	82.3126538630111
2014	82.5473446702494
2015	82.44574070823813
2016	82.63969981232715
2017	82.70199488452428
2018	82.80418013856931
2019	83.03803339811563
2020	82.16609390357533
2021	81.77234402153233
2022	82.43549471752509