Year	years
1960	56.52992633642667
1961	56.93055052174418
1962	57.29761385120915
1963	57.345736606499706
1964	57.93832909260761
1965	58.616172835156824
1966	58.85369129574031
1967	59.06544063991824
1968	59.32168867125045
1969	59.47019053350606
1970	59.87599129864934
1971	60.1953877050665
1972	60.528581113791745
1973	60.872251010155125
1974	59.64922060974202
1975	60.1368889593555
1976	60.5385821159549
1977	60.77163175835919
1978	60.73075719744059
1979	61.05430509161543
1980	61.92625103963017
1981	62.26502444337462
1982	62.56185937748237
1983	62.81959390773363
1984	63.37012158059438
1985	63.68644531795363
1986	64.05820416049237
1987	64.56817580353265
1988	64.83294648103147
1989	65.5541010642658
1990	65.62670770191248
1991	65.65101489636324
1992	65.64647152447779
1993	65.75668898464917
1994	65.43893977990558
1995	65.60659103417622
1996	65.92224877607697
1997	65.93382052245423
1998	65.80436603860456
1999	65.59302447657097
2000	66.8671665418733
2001	67.13489773175188
2002	67.29447564831041
2003	67.50214427799926
2004	67.78494106794116
2005	68.1048848286788
2006	68.42370250474332
2007	68.84462039765137
2008	69.28225147362626
2009	69.75630917767893
2010	70.31829303821455
2011	70.71672987045707
2012	71.12869333897062
2013	71.58339159079861
2014	71.93342679560894
2015	72.29156326693881
2016	72.62721997104532
2017	73.0133546433457
2018	73.24014831215477
2019	73.4700633121699
2020	73.17339643956473
2021	72.36689870100471
2022	72.87026255598097