Year	years
1960	72.02057242530263
1961	72.4999869281166
1962	72.52169481042915
1963	72.73587123853171
1964	73.3573866391584
1965	73.4525006373523
1966	73.73332246730098
1967	73.96050736760793
1968	73.90522160926531
1969	73.90208267807718
1970	74.33142318689227
1971	74.5383623556492
1972	74.92245111283245
1973	75.04327267216108
1974	75.43648934730838
1975	75.544603721019
1976	75.89737737596099
1977	76.38933961449585
1978	76.56403813733564
1979	76.92451658784694
1980	77.08349356123183
1981	77.35855433601577
1982	77.69027416372774
1983	77.75861526996677
1984	78.1829968922067
1985	78.29482337139854
1986	78.55061362781697
1987	78.90917253877872
1988	79.10350538361507
1989	79.31526927682981
1990	79.39903969058007
1991	79.59274544469086
1992	79.95418742776317
1993	80.01717877460992
1994	80.32768429250639
1995	80.47336862247236
1996	80.68383710506714
1997	80.9751612383008
1998	81.13618333799654
1999	81.32802524805552
2000	81.54877086003202
2001	81.84452515035616
2002	81.87680027346512
2003	81.80178132315189
2004	82.39641192222497
2005	82.50477370908392
2006	82.93845204747737
2007	83.13314607908617
2008	83.2520066008085
2009	83.43590402315016
2010	83.65417946558013
2011	84.15021998329124
2012	84.05989411044987
2013	84.29558948162952
2014	84.70855751438734
2015	84.24077472969374
2016	84.64789522726586
2017	84.52356721259119
2018	84.6451476851302
2019	84.89648178060189
2020	84.16046277553525
2021	84.29802363300496
2022	84.27465806163048