Year	years
1960	56.77763523368401
1961	57.33976405723329
1962	57.81116910906313
1963	58.270985207297294
1964	58.78052779905549
1965	59.2229271860171
1966	59.620951668824596
1967	60.01291754563385
1968	60.40930625648281
1969	60.790421563192254
1970	60.75564062262292
1971	61.68755958910727
1972	62.11269392190574
1973	62.67728693035854
1974	63.10326121063982
1975	63.685207665395595
1976	63.98730502644425
1977	64.64720097561714
1978	65.08615162028701
1979	65.52276220403182
1980	65.96439061643946
1981	66.51506898058703
1982	66.87060225234673
1983	67.4120810737117
1984	67.85059295805938
1985	68.1125496177949
1986	68.76604486181355
1987	69.25330892020573
1988	69.69743441095947
1989	70.14010054886452
1990	70.57461419506241
1991	70.92664352015655
1992	71.29721323354813
1993	71.64554570598891
1994	72.0048254405634
1995	72.37171525506116
1996	72.7626892799803
1997	73.10945944672585
1998	73.33543107488681
1999	73.80083317651916
2000	74.22162671564777
2001	74.57099064629985
2002	74.84332799089297
2003	74.98283627498422
2004	75.30852339989332
2005	75.63925424261801
2006	75.85734187556072
2007	75.99298662895534
2008	76.21293373494429
2009	76.39140845766654
2010	76.25399130559552
2011	76.77010554251224
2012	77.02986912986859
2013	77.22798827760217
2014	77.41698207085437
2015	77.51883641368644
2016	77.58952191522944
2017	77.69343870494829
2018	77.83769115285286
2019	78.04876167156688
2020	76.36433713798937
2021	75.43874180582448
2022	76.7420485862062