Year	years
1960	43.42295374721575
1961	44.11603266380349
1962	44.349759174164966
1963	45.696742897804974
1964	46.394212135790376
1965	46.98998649305563
1966	47.43446441325075
1967	47.85159711401967
1968	48.295711476463616
1969	48.85086001504421
1970	49.40004567803155
1971	50.07544210542965
1972	50.6400942045653
1973	50.991782301141114
1974	51.812356225582484
1975	52.29167928787914
1976	52.782737959676425
1977	54.09029656144516
1978	54.59836975074361
1979	55.719476541144054
1980	55.67093883640497
1981	54.927617537583146
1982	55.25621990452524
1983	56.87193410702064
1984	58.50059858363863
1985	59.27823598810598
1986	59.72285529773431
1987	60.62738114589016
1988	60.964824415181205
1989	62.36323396226743
1990	62.322406494046
1991	63.624964207158534
1992	64.25944622538825
1993	64.59486131881961
1994	64.6331286254714
1995	64.94431479781427
1996	65.30691559012496
1997	65.5678834948826
1998	65.83527741544381
1999	66.2334595910548
2000	66.51957647270861
2001	66.86584225752406
2002	67.20712976883492
2003	66.9564806344295
2004	67.37419507431996
2005	67.59414885898948
2006	67.64222381976096
2007	67.97671772072727
2008	68.39549341118244
2009	68.78902679265086
2010	68.98794239878012
2011	69.19215100043041
2012	68.95123206878907
2013	68.93763013102942
2014	69.29005166220246
2015	69.60412719784802
2016	69.71281235036517
2017	70.17581460307618
2018	70.49153340848173
2019	70.72703466980353
2020	69.73565235417047
2021	69.51306322469391
2022	69.90672126902713