Year	years
1960	43.015638094803016
1961	43.395855642490226
1962	43.71042067301691
1963	44.03557896543023
1964	44.51702832078213
1965	44.66610037670681
1966	44.578624746593
1967	44.99742105091334
1968	45.42200965710935
1969	45.66602412237997
1970	46.01550591426389
1971	46.52411588552485
1972	46.64124512912266
1973	47.27646337253259
1974	47.481603716626985
1975	47.86693997968956
1976	48.64620120757337
1977	49.17471748092111
1978	49.5745080069129
1979	50.00245350269365
1980	50.3576826079442
1981	50.75467863104067
1982	51.02072677843558
1983	50.17601289568202
1984	50.30743761882982
1985	50.56385163121036
1986	50.969234027512314
1987	51.452350645214665
1988	51.17649257585347
1989	51.91142452309702
1990	51.93566459775717
1991	51.71728852465928
1992	51.52583489059079
1993	51.77750465706595
1994	51.87817550144703
1995	52.013561884896895
1996	51.92219157810899
1997	52.03151946107882
1998	51.81229346993793
1999	52.442602012048596
2000	52.752335122315756
2001	52.93456251814286
2002	53.27624732338937
2003	53.70586636054043
2004	54.16620577494057
2005	54.786753254528705
2006	55.53172059547608
2007	56.21272296281418
2008	56.836895896882154
2009	57.69446996428965
2010	58.35371241817716
2011	59.13999921811031
2012	59.78076829261686
2013	60.39581244089927
2014	60.923721386700045
2015	61.36737034972571
2016	61.88664687953525
2017	62.30545312471536
2018	62.72843317688088
2019	63.13765185559283
2020	62.828838645803785
2021	62.277173992766585
2022	62.77167295947984