Year	years
1960	52.393067087531904
1961	52.928526219900064
1962	53.416338523842995
1963	53.878442322576554
1964	54.33305143211003
1965	54.66320909799497
1966	55.11084462249936
1967	55.450449283730336
1968	55.77957553371919
1969	56.1293787942191
1970	56.16985631167989
1971	56.96599283272233
1972	57.34758087373228
1973	57.818900014715275
1974	58.18808376434379
1975	58.635277998040934
1976	58.84688596140117
1977	59.29708830992073
1978	59.597105284060035
1979	59.90783893284404
1980	60.338842711702604
1981	60.7489327244994
1982	61.05510671264622
1983	61.67708939184955
1984	62.08588894561166
1985	62.44915994963074
1986	63.00543041000668
1987	63.398305992747154
1988	63.834663906838706
1989	64.15098263489058
1990	64.32245881445257
1991	64.64646808735155
1992	64.96683019635607
1993	65.30991433890934
1994	65.74975977819598
1995	66.03386108717163
1996	66.44142916738868
1997	66.77588209553936
1998	67.0857207450026
1999	67.52725566916303
2000	67.73291859441122
2001	68.07711863251788
2002	68.36597626709784
2003	68.69203265208583
2004	68.98688578253409
2005	69.40106524545348
2006	69.62294047862751
2007	69.7822597520309
2008	70.06393517915544
2009	70.28633723152905
2010	70.16813721276392
2011	70.6740975077774
2012	70.90314947471185
2013	71.20200321816081
2014	71.47767232924092
2015	71.47412352932385
2016	71.41440127046386
2017	71.63415636500072
2018	71.74917562197695
2019	71.91993487576703
2020	69.49765673030795
2021	68.58469608985021
2022	70.54885430784164