Year	years
1960	43.83422493013547
1961	48.51571367659733
1962	54.787717060100675
1963	55.26823094743047
1964	55.91066965214363
1965	56.39295529065512
1966	56.903636670172425
1967	57.323129418467445
1968	57.689924176725874
1969	58.139730433528506
1970	58.889352803374706
1971	59.599334311384226
1972	60.09112562400116
1973	60.902085822501796
1974	61.45278215379651
1975	62.16121922417397
1976	62.78257169568845
1977	63.381863878113926
1978	63.9115684791393
1979	64.40222845369539
1980	64.87618800641182
1981	65.38777445407929
1982	65.82519581282344
1983	66.20344986420115
1984	66.51888275789541
1985	66.85631788138843
1986	67.34111137778021
1987	67.65187018527067
1988	67.88066295855423
1989	68.11514463938094
1990	68.25341754738663
1991	68.40002886848912
1992	68.70163386813775
1993	68.93831635238737
1994	69.14343688101522
1995	69.40908093277602
1996	69.75904796623234
1997	70.18327906479124
1998	70.61190492063999
1999	70.76304300160152
2000	71.07867528598503
2001	71.62407221684288
2002	71.92144525319723
2003	72.33391383401347
2004	72.63780546281525
2005	73.03141242874901
2006	73.45089488568321
2007	73.7432702982702
2008	73.92101891660712
2009	74.33245812651427
2010	74.61509393454457
2011	74.94891714972263
2012	75.22591829111558
2013	75.52036230623757
2014	75.78971453892483
2015	76.01184827489512
2016	76.25676920744704
2017	76.39813914455479
2018	76.76900002214661
2019	76.99116877036003
2020	76.72040172968423
2021	76.36781722560913
2022	77.09815467637651