Year	years
1960	46.95408162197766
1961	49.452534848442674
1962	52.675465090480294
1963	53.11865896154266
1964	53.664172898424745
1965	53.58676666085423
1966	54.14661415277327
1967	54.636422347761744
1968	55.299027028893825
1969	55.68613316255365
1970	56.03652721675914
1971	56.360136962262395
1972	57.17614346852325
1973	57.81134559029744
1974	58.32412529051116
1975	58.853631864396164
1976	59.40660919352458
1977	60.03833483821823
1978	60.55153752711546
1979	61.06841710799515
1980	61.55577148567471
1981	62.04256183456346
1982	62.480093823065495
1983	62.80442156772398
1984	63.14128955578796
1985	63.47968867540513
1986	63.9413587315944
1987	64.30141093755941
1988	64.5601844206917
1989	64.9223788226955
1990	65.13761572928415
1991	65.20749149018836
1992	65.50813126317391
1993	65.78886646156073
1994	66.01170976892023
1995	66.3102166017087
1996	66.52415201543349
1997	66.88682848166275
1998	67.24561623441527
1999	67.5379329808496
2000	67.90273167724604
2001	68.37646311280673
2002	68.69968620696193
2003	69.00928136897464
2004	69.24842497566479
2005	69.6858871568791
2006	70.10979297265132
2007	70.42007101984436
2008	70.58860745030756
2009	71.04103948131788
2010	71.33622969170314
2011	71.71785452606424
2012	72.06063255204671
2013	72.39954833607604
2014	72.68341380684946
2015	72.94895427453552
2016	73.2476591290598
2017	73.52646993827352
2018	73.76907850926581
2019	73.97677570810482
2020	73.395063340744
2021	72.34850800947838
2022	73.01571535276585