Year	years
1960	54.53502130587183
1961	55.141455142103915
1962	55.83191856857115
1963	56.451815243013364
1964	56.661139689728394
1965	57.70647953232738
1966	58.17890625648616
1967	58.7203744210699
1968	59.168299694827276
1969	59.41039599781395
1970	59.823680022366375
1971	60.19277842916316
1972	60.46180396728959
1973	60.42949665534349
1974	61.01216765441315
1975	61.045945070891
1976	61.66045360795063
1977	61.911104942702444
1978	62.36044827195945
1979	62.74066079680094
1980	62.8499762791294
1981	63.04117442954247
1982	63.24433810266118
1983	63.65552048060602
1984	64.09659580742624
1985	64.52004527956275
1986	64.63559730728625
1987	64.92031946571167
1988	65.25944493305856
1989	65.42753887523908
1990	65.70301232038635
1991	65.87955546278243
1992	66.09130680672897
1993	66.27283445088106
1994	66.47968641538894
1995	66.7313986981694
1996	66.9085682484442
1997	67.03747250459925
1998	67.23718662653644
1999	67.3133507965179
2000	67.30394872813139
2001	67.41204517686421
2002	67.20526610886374
2003	67.51969951296707
2004	67.68820691006113
2005	67.83041239032006
2006	67.98573346419435
2007	67.96521287191078
2008	68.12384038417777
2009	68.02361266641945
2010	68.395698405641
2011	68.53138451670908
2012	68.59709178317786
2013	68.62577394946096
2014	68.64263989416597
2015	68.56220876131903
2016	68.82751123689447
2017	69.11886489235842
2018	69.21374828616389
2019	69.29425140877008
2020	69.36492110040345
2021	69.16359418284318
2022	69.73483483939496