Year	years
1960	70.64116420296558
1961	70.95432052136259
1962	70.85918959863606
1963	71.23143503364103
1964	71.78752189776309
1965	71.80561380855808
1966	72.05867987886046
1967	72.12577680247641
1968	72.1770148221347
1969	72.05473296602902
1970	72.59705666966525
1971	72.84654287187946
1972	73.055447380382
1973	73.176980454503
1974	73.46348389902414
1975	73.4765954336938
1976	73.6205456854764
1977	73.94058487582373
1978	74.03297288705943
1979	74.18261355012423
1980	74.32521442648522
1981	74.60510778260151
1982	74.88588618728187
1983	74.92459820009881
1984	75.06090976987049
1985	75.15576364081025
1986	75.59837287608663
1987	75.83065414449108
1988	75.94753435477813
1989	76.1530245564828
1990	76.21381410459692
1991	76.16256102103615
1992	75.963461091585
1993	75.79280458936532
1994	76.09331306816978
1995	76.12429172380027
1996	76.43575309411308
1997	76.72538626569298
1998	76.97614767644554
1999	76.93650610489442
2000	77.21089196673621
2001	77.42879704212045
2002	77.50251729103246
2003	77.57277652410762
2004	78.02737667597184
2005	78.15041663919203
2006	78.57997869787361
2007	78.88122686354205
2008	79.06755117195644
2009	79.38442401536949
2010	79.60996023643675
2011	80.0695862130111
2012	80.16342425382167
2013	80.46516853881104
2014	80.76668263463229
2015	80.61905350730825
2016	80.94181397989261
2017	81.0546048431435
2018	81.18468329794561
2019	81.43027492534006
2020	80.27170417789328
2021	79.86178069100974
2022	81.0588801448828