Year	years
1960	41.63825658118905
1961	46.57701997035415
1962	53.28661057596427
1963	53.816421146948905
1964	54.50712280855001
1965	54.46905519512889
1966	55.544012765441096
1967	56.37008105399306
1968	56.78502331986799
1969	57.423578486481404
1970	58.03641151903439
1971	58.86068804893679
1972	59.41108408725592
1973	60.25748971554457
1974	60.858600882932784
1975	61.58067696501637
1976	62.34898637531413
1977	63.05720409910335
1978	63.644314427886954
1979	64.23028744275402
1980	64.71690168637014
1981	65.19942467254054
1982	65.66703814367024
1983	66.04540973409549
1984	66.43748293312666
1985	66.80390565583475
1986	67.15191774219993
1987	67.4970112362796
1988	67.74233687052407
1989	68.06317845183642
1990	68.27017914986446
1991	68.49225530273505
1992	68.95877060730251
1993	69.40109273938839
1994	69.6691898551765
1995	69.92265131344412
1996	70.20833401568557
1997	70.58369222272297
1998	70.97034433122982
1999	71.16578605643795
2000	71.55255395204976
2001	72.11293429067962
2002	72.45024172853023
2003	72.86440321910504
2004	72.96315999168091
2005	73.43933500839786
2006	73.79191692575036
2007	74.03501180913652
2008	74.00471203710285
2009	74.53250749517272
2010	74.73430067634618
2011	74.97132236656955
2012	75.22971722487904
2013	75.47911470932803
2014	75.73116269467954
2015	75.94873611561543
2016	76.13787495930362
2017	76.212440060682
2018	76.59395885035103
2019	76.79768228484083
2020	76.75970168802438
2021	76.39329501858417
2022	76.90204606245598