Year	years
1960	45.70738061146006
1961	46.11873744762684
1962	46.47932549522507
1963	46.77237014297199
1964	47.350161565708454
1965	47.42047396615191
1966	47.118291326879806
1967	47.84522502014856
1968	48.151971796256554
1969	48.3988985188352
1970	48.68132697267159
1971	49.206512088718256
1972	48.91536422280059
1973	49.59700211574279
1974	49.48796891505771
1975	49.61900931046598
1976	50.33142633447783
1977	50.6851958046723
1978	50.92937190930306
1979	51.36497203864533
1980	51.71798435040509
1981	52.221953771655194
1982	52.493403158805975
1983	50.89751396361993
1984	51.01596675522178
1985	51.34797651376731
1986	52.00564100962657
1987	52.59736337317971
1988	51.98749759301027
1989	53.08071897969951
1990	53.065839551473395
1991	52.74605512710586
1992	52.367848448540926
1993	52.73532522381451
1994	53.032132237113814
1995	53.189836775986535
1996	52.96035916512349
1997	53.038581734363135
1998	52.620748145347015
1999	53.39611393051324
2000	53.66220754896184
2001	53.77262631187071
2002	54.104872027507035
2003	54.49536529610089
2004	55.02003709095081
2005	55.71769736300472
2006	56.671295284548506
2007	57.531256546039806
2008	58.379386485734216
2009	59.450952771932904
2010	60.309674621723175
2011	61.3002881377364
2012	62.14798379484718
2013	62.93590022030261
2014	63.64117730706809
2015	64.19112513460563
2016	64.86779082283422
2017	65.30400970153788
2018	65.8281070906573
2019	66.21972630008455
2020	65.8364652190824
2021	65.07847216073229
2022	65.49063791294859