Year	years
1960	43.42295374721574
1961	44.11603266380348
1962	44.349759174164966
1963	45.69674289780498
1964	46.39421213579038
1965	46.98998649305563
1966	47.43446441325075
1967	47.851597114019675
1968	48.29571147646362
1969	48.85086001504422
1970	49.40004567803156
1971	50.07544210542965
1972	50.64009420456531
1973	50.99178230114112
1974	51.81235622558248
1975	52.291679287879134
1976	52.78273795967643
1977	54.09029656144516
1978	54.59836975074362
1979	55.71947654114405
1980	55.67093883640497
1981	54.927617537583146
1982	55.25621990452524
1983	56.87193410702065
1984	58.50059858363863
1985	59.27823598810598
1986	59.72285529773431
1987	60.627381145890155
1988	60.96482441518121
1989	62.36323396226743
1990	62.3563688032434
1991	63.65125934507184
1992	64.28249891756772
1993	64.61689670964601
1994	64.66286430091735
1995	64.97368967486169
1996	65.33816249927204
1997	65.60131901288466
1998	65.86857394033602
1999	66.26507663238134
2000	66.53804990213467
2001	66.86890551515798
2002	67.22530161937385
2003	66.97559581525631
2004	67.38909225038083
2005	67.62149859656523
2006	67.66395890617993
2007	67.99747725478105
2008	68.4159612183542
2009	68.80733056099174
2010	69.0089253361731
2011	69.21309679014082
2012	68.97687433510015
2013	68.9725089038475
2014	69.29588469645455
2015	69.6348477604009
2016	69.74315919860197
2017	70.20444011925538
2018	70.51384736950153
2019	70.75443423515658
2020	69.76362996242952
2021	69.53146360672754
2022	69.91985493869129