Year	years
1960	43.87914755029954
1961	46.24208438731099
1962	49.30224363035189
1963	49.74252607215967
1964	50.276136110103465
1965	49.95070335823609
1966	50.6698020296331
1967	51.12705780382084
1968	51.79106045707413
1969	52.18825995264105
1970	52.55769028716219
1971	52.49999650467248
1972	53.701933599962366
1973	54.32810403307229
1974	54.76218431845462
1975	55.26878888105535
1976	55.79291858426924
1977	56.2653125048974
1978	56.65169900398263
1979	57.07956371513209
1980	57.460468006855955
1981	57.82488302575335
1982	58.19357729753869
1983	58.488774614556704
1984	58.822605843868416
1985	59.2088631964995
1986	59.66983271377324
1987	59.99359321426439
1988	60.18100992880008
1989	60.57979978016196
1990	60.75900647712576
1991	60.99016258628897
1992	61.25835544426008
1993	61.443105286181456
1994	61.73618405084388
1995	62.01331163867912
1996	62.31719610673657
1997	62.679168505450576
1998	62.95812081379586
1999	63.34134244453612
2000	63.6575275576536
2001	63.95667948288235
2002	64.27694294594136
2003	64.5335091534392
2004	64.76582863115576
2005	65.12428584148851
2006	65.49078515423226
2007	65.7408753460342
2008	65.93371503396644
2009	66.32703875019087
2010	66.6227465676397
2011	66.97663541047322
2012	67.26842141291071
2013	67.5805579666978
2014	67.93466164699672
2015	68.23757411190661
2016	68.50223335255005
2017	68.70400314284352
2018	69.00448490293107
2019	69.20218924685491
2020	68.41564806608801
2021	67.40697361165569
2022	68.14770800204589