Year	years
1960	43.93002173732241
1961	48.60208060858358
1962	54.90937515987666
1963	55.47458228555039
1964	56.124168146939326
1965	56.35498710791015
1966	57.12492746298107
1967	57.836847015018705
1968	58.36241054412495
1969	58.90808792370047
1970	59.49203953286536
1971	60.2796904501774
1972	60.975989251996445
1973	61.78371315461949
1974	62.50191653080433
1975	63.176678850526116
1976	63.84671023062387
1977	64.5390121277144
1978	65.09170903193412
1979	65.69950073067365
1980	66.26355242735389
1981	66.7906673621425
1982	67.26586594983748
1983	67.7656156147249
1984	68.16932450905774
1985	68.54645906694867
1986	69.01544419125725
1987	69.38265900037324
1988	69.65819118215424
1989	69.97484619715833
1990	70.1363162947938
1991	70.26264673559632
1992	70.75034468085356
1993	71.1744583285162
1994	71.36704623274066
1995	71.76960140323348
1996	71.99415129815061
1997	72.3425015356398
1998	72.78805690560685
1999	72.87675203992981
2000	73.32236374182854
2001	74.00611446246978
2002	74.28224709083707
2003	74.53591126365677
2004	74.66736169755335
2005	75.16445607762628
2006	75.51323320991705
2007	75.78227255089024
2008	75.89897036422178
2009	76.32121022447242
2010	76.58281836721333
2011	76.87290180490649
2012	77.20914003314306
2013	77.48944013921876
2014	77.74064577921136
2015	77.95648361566776
2016	78.20850963461935
2017	78.45037572337291
2018	78.7248823195706
2019	78.91156451743747
2020	78.28847649557206
2021	77.88537942077403
2022	78.50779560124184