Year	years
1960	42.85411092770643
1961	43.36649687296321
1962	43.954763473139025
1963	44.27146748326769
1964	44.931809805846434
1965	45.11924658411779
1966	45.60364732337895
1967	46.033639091292386
1968	46.55012988193936
1969	46.901187313605526
1970	46.4146636159612
1971	44.12184393530119
1972	47.87693963934154
1973	48.407028411839875
1974	48.51528682606687
1975	48.70091663897487
1976	49.277955178212416
1977	49.85860072215302
1978	50.22902555633006
1979	50.657288013690746
1980	51.16313327085992
1981	51.542985599446325
1982	51.76971429525569
1983	51.56515401299903
1984	51.70436056188602
1985	51.948304486562414
1986	52.36853937787926
1987	52.72615839119904
1988	52.68860031356102
1989	53.325337983209344
1990	53.55564679079413
1991	53.322289109238326
1992	53.64322072552884
1993	53.888748218787654
1994	54.234642399318496
1995	54.42999144647849
1996	54.565797804637704
1997	55.00914742548013
1998	55.24799411024841
1999	56.187800595524536
2000	56.63170080245032
2001	57.01124339586935
2002	57.4175623707504
2003	57.85886586840762
2004	58.179602996072205
2005	58.60053948424088
2006	59.23873613693904
2007	59.5910104996775
2008	59.773684274088815
2009	60.451432222413345
2010	60.89852696243462
2011	61.455360850920115
2012	61.77098085570556
2013	62.10515024469133
2014	62.4180887324393
2015	62.75171706141373
2016	63.16565331525459
2017	63.54116945810773
2018	63.88110119695857
2019	64.21240643971596
2020	63.748248344655764
2021	63.40066424565102
2022	64.04892352081865