Year	years
1960	47.59978445181542
1961	50.5186424494781
1962	54.325187816211916
1963	54.78984279611284
1964	55.30827139930785
1965	55.179350558414264
1966	55.76314995331648
1967	56.24385103409963
1968	56.94423600759255
1969	57.34283532468515
1970	57.889844937382854
1971	58.49194060141899
1972	58.94967554581507
1973	59.617017551712244
1974	60.237376186579155
1975	60.86624130191525
1976	61.42611880260285
1977	62.05840972338739
1978	62.5914425592383
1979	63.13589886277868
1980	63.64646626679782
1981	64.16644300290973
1982	64.65437622803984
1983	65.12782029022843
1984	65.50209239969445
1985	65.89852047448039
1986	66.39883247788698
1987	66.76417989166725
1988	67.10646198047378
1989	67.44666721550249
1990	67.67314475071524
1991	67.85765404981835
1992	68.17549127829739
1993	68.50613584215232
1994	68.7499524995221
1995	69.09502129674605
1996	69.3684851924605
1997	69.7148125377098
1998	70.1171327722227
1999	70.28278057664566
2000	70.69597352152269
2001	71.2309138300556
2002	71.55518273821188
2003	71.8497623706152
2004	72.10309204790794
2005	72.5602950742946
2006	72.94058505649045
2007	73.25631517345482
2008	73.45985279975511
2009	73.85378621135926
2010	74.13679035049115
2011	74.4768525415786
2012	74.82271096824641
2013	75.14337512541988
2014	75.45935743065952
2015	75.72840802044081
2016	76.02256876317551
2017	76.28702236891687
2018	76.53860046629785
2019	76.73149547871553
2020	76.13267236061905
2021	74.85788191123487
2022	75.5641237370072