Year	years
1960	42.67927723794427
1961	43.083039373548665
1962	43.43142034074281
1963	43.719840932642086
1964	44.3594799850617
1965	44.450467202142924
1966	44.228213717935915
1967	45.02973624315186
1968	45.37851952255648
1969	45.6806524978246
1970	45.99573079355831
1971	46.49757031589373
1972	46.29971911026424
1973	46.979038808228445
1974	46.988665205722384
1975	47.25046855198374
1976	48.043508606355104
1977	48.38222953931594
1978	48.71201470752646
1979	49.157426532421745
1980	49.56305653378242
1981	49.82690126824183
1982	50.07343573989203
1983	48.69852509397707
1984	48.752529523901245
1985	49.08323749225223
1986	50.0046061263699
1987	50.82656910023067
1988	50.37042105964324
1989	51.72793538691715
1990	51.90239645413933
1991	51.712008656102896
1992	51.63918139441642
1993	52.45974793771162
1994	52.93009875880017
1995	52.69862961228591
1996	52.83532024731193
1997	53.26926027460107
1998	53.14017430750132
1999	54.24247015778335
2000	54.81990723180813
2001	55.28445564044205
2002	55.76991471367071
2003	56.88742997928049
2004	57.36981534028053
2005	58.02714106519945
2006	58.87715846751887
2007	59.623664090111724
2008	60.22317991582877
2009	61.02901958177754
2010	61.52659277060244
2011	62.15969539322821
2012	62.545773344407195
2013	63.06374285702944
2014	63.46874282904987
2015	63.914282460027536
2016	64.49976515600281
2017	64.95669696761145
2018	65.43605685997511
2019	65.81821929517227
2020	65.36778175436187
2021	65.03923683537428
2022	65.56025784853254