Year	years
1960	45.10236657586084
1961	45.41864883877935
1962	45.80234044836154
1963	46.11492518546617
1964	46.50559158769764
1965	45.58171012431266
1966	46.15194704094945
1967	46.5582784519007
1968	48.07739835518713
1969	48.47708327450871
1970	48.28075164559699
1971	46.712437362565026
1972	49.62706175756303
1973	50.08581875940183
1974	50.586495119565804
1975	51.19119806479591
1976	51.711182055223624
1977	52.1965213082996
1978	52.71030297409157
1979	53.212730392862305
1980	53.758288900355105
1981	54.31738995113179
1982	54.82958595528843
1983	55.37277903562779
1984	55.841522762278025
1985	56.2940311213287
1986	56.82177581661537
1987	57.22722801828781
1988	57.673149592128546
1989	58.05577907946841
1990	58.56024242268928
1991	58.736641019577185
1992	59.376580797050046
1993	59.71141771151245
1994	60.10371479684527
1995	60.457692378022585
1996	60.825230629743864
1997	61.34399000735732
1998	61.929252302663265
1999	62.557148979252794
2000	62.89296614641418
2001	63.30370735311542
2002	63.77152963823155
2003	64.19977294126205
2004	64.54003483249686
2005	64.91629809659547
2006	65.37140474402182
2007	65.63227681619144
2008	65.9610070803582
2009	66.2545914531589
2010	66.75099423868224
2011	67.1424365863389
2012	67.63201788965391
2013	68.12140150354494
2014	68.63825069535629
2015	69.14378351471629
2016	69.60957244170798
2017	69.97928937862724
2018	70.2534786113924
2019	70.4727549740685
2020	69.74833091613252
2021	67.5791290463818
2022	68.1609330214255