Year	years
1960	71.77402808981286
1961	72.20165823068321
1962	72.21680037892317
1963	72.5005366583296
1964	73.05304970513633
1965	73.14949765698779
1966	73.42996623099444
1967	73.79038591633983
1968	73.7450798425255
1969	73.87732045061782
1970	74.12889834793725
1971	74.45469040258119
1972	74.68136725589412
1973	74.86028172831365
1974	75.23223104825774
1975	75.60318289617797
1976	75.86818540186651
1977	76.30531399464644
1978	76.46768262413734
1979	76.82439653418554
1980	76.8109368586222
1981	77.1481122776757
1982	77.47240773335513
1983	77.54681966048923
1984	77.82553660444103
1985	77.91231072669237
1986	78.1895693134189
1987	78.47658787427987
1988	78.56872263419613
1989	78.83042171771622
1990	78.9890146702399
1991	79.12159529478247
1992	79.29586863916965
1993	79.26113679745094
1994	79.57502856545642
1995	79.56065218340885
1996	79.8513837636347
1997	80.1284680025334
1998	80.30433681917701
1999	80.36420670079117
2000	80.55854495979695
2001	80.81740640787176
2002	80.93447995995896
2003	81.01880257597084
2004	81.42892043338026
2005	81.49870802548459
2006	81.81434769807473
2007	82.03635103043956
2008	82.13416391267405
2009	82.41657726288923
2010	82.57413398688468
2011	82.81680017186684
2012	82.89695993137192
2013	83.04540676232362
2014	83.29202324078888
2015	83.11815489870025
2016	83.28761253534198
2017	83.2960993513902
2018	83.38226069270092
2019	83.61515188114974
2020	82.84417806295207
2021	82.59854210810843
2022	82.89025195120983