Year	years
1960	67.30622008846895
1961	67.73093492757029
1962	67.74722692332628
1963	67.96551341998182
1964	68.4304355469184
1965	68.56490276498302
1966	68.82185704630355
1967	69.14004877225535
1968	69.0277385922928
1969	69.18057900316383
1970	69.46059390307097
1971	69.75679112631217
1972	70.0144192788676
1973	70.20084446182196
1974	70.59226768880315
1975	70.8925966100739
1976	71.16605454563141
1977	71.57613570115218
1978	71.74959366347525
1979	72.10599659970045
1980	72.17539395749907
1981	72.561832644178
1982	72.9155490753869
1983	73.05410131032683
1984	73.36365021453905
1985	73.45214433692932
1986	73.7735165596062
1987	74.06703794466631
1988	74.20764073870842
1989	74.44798455130032
1990	74.60307478720016
1991	74.79537146456492
1992	75.06615133206138
1993	75.1682268461539
1994	75.45626602556044
1995	75.54634000491255
1996	75.9198217480041
1997	76.25545147782019
1998	76.45866388328814
1999	76.57453305487263
2000	76.91642858154383
2001	77.20344117425896
2002	77.37869710126998
2003	77.50530396081248
2004	77.89854341927708
2005	78.01183133639793
2006	78.29782144410024
2007	78.50505311229972
2008	78.65647436013172
2009	78.9200247316373
2010	79.09273510945604
2011	79.31967793127642
2012	79.47425580621017
2013	79.67079969574263
2014	79.91900465470727
2015	79.79414234917732
2016	79.90687403922666
2017	79.93333514620218
2018	80.0115717465781
2019	80.22354187656556
2020	78.89938357591524
2021	78.6662054863823
2022	79.63079874536173