Year	years
1960	68.2961765960583
1961	68.67084741837883
1962	68.58880128223673
1963	68.85920497992291
1964	69.36160067779466
1965	69.40612603376715
1966	69.64159379437542
1967	69.83581645129158
1968	69.71327931467502
1969	69.74269439216471
1970	70.16775785781894
1971	70.46668157006924
1972	70.66194268520752
1973	70.82450690951842
1974	71.16342941095411
1975	71.35733548679708
1976	71.56136005878501
1977	71.88830058699754
1978	72.02227181768379
1979	72.28189113097136
1980	72.29849078681193
1981	72.65429073667181
1982	72.99984669333477
1983	73.06827770068872
1984	73.2592000342329
1985	73.43397061175791
1986	73.84236972834718
1987	74.08515119245779
1988	74.18521508225066
1989	74.34625725472434
1990	74.43757680401407
1991	74.55080725710603
1992	74.58488935502645
1993	74.41543042352254
1994	74.6098757742115
1995	74.69727612585422
1996	75.16011804735798
1997	75.55014683112579
1998	75.7738656465419
1999	75.78851631838653
2000	76.01643914447004
2001	76.28390156541053
2002	76.41055206605465
2003	76.51774210711774
2004	76.96072799457733
2005	77.08178651039172
2006	77.50981273847975
2007	77.81994863772475
2008	78.01258071460195
2009	78.36567441213796
2010	78.55336310368652
2011	78.8918823622061
2012	79.04351007094864
2013	79.27338510594784
2014	79.51833028045556
2015	79.46670730771677
2016	79.66119233164022
2017	79.7827279432975
2018	79.88722443579681
2019	80.1270377077866
2020	79.13325437092085
2021	78.7883989599385
2022	79.50211314710286