Year	years
1960	44.676095680227455
1961	47.395032094461435
1962	50.97036177506875
1963	51.419743328452306
1964	51.989968312853925
1965	51.937376075318056
1966	52.54871452091326
1967	53.138822884269885
1968	53.861638444977885
1969	54.35219743687944
1970	54.659557032604724
1971	55.009361306126166
1972	55.911781769724016
1973	56.60930140408133
1974	57.162672649047224
1975	57.774800327752374
1976	58.39052817148467
1977	59.069661482456986
1978	59.6307293788891
1979	60.20488001802485
1980	60.74581013248528
1981	61.25022575862414
1982	61.707088991603804
1983	62.07264012735306
1984	62.46266507946869
1985	62.8231924444396
1986	63.277921493456226
1987	63.67046813200307
1988	63.9389832429764
1989	64.33893066044511
1990	64.58012718474575
1991	64.68186758040402
1992	65.07393891414404
1993	65.40979832448113
1994	65.62082146501017
1995	65.88706043994722
1996	66.09004288878198
1997	66.45629980168664
1998	66.82159351136893
1999	67.15461371591452
2000	67.53397107103235
2001	68.03964439079841
2002	68.38094883549003
2003	68.75751975297673
2004	68.98652670053866
2005	69.43775550666747
2006	69.85433592136683
2007	70.15824433240023
2008	70.32705868602054
2009	70.78481625550431
2010	71.0918090116074
2011	71.46592516179926
2012	71.82061106634853
2013	72.1629107786407
2014	72.45666106021342
2015	72.72748418393542
2016	73.02859662819073
2017	73.31100745198808
2018	73.56021630176423
2019	73.7665356855976
2020	73.22668207711435
2021	72.2048235184431
2022	72.8031284268149