Year	years
1960	50.89433055076839
1961	52.846477494913074
1962	55.20878268737837
1963	55.54242961306407
1964	56.03495286225328
1965	55.860706313139815
1966	56.38980370426508
1967	56.79483280739327
1968	57.22546217024157
1969	57.535588899067584
1970	57.84098146951919
1971	57.967285963965836
1972	58.79295675912965
1973	59.29467367233107
1974	59.71366648291249
1975	60.16614914652639
1976	60.62583826479465
1977	61.120966079007225
1978	61.48148995615571
1979	61.90281717177587
1980	62.23361693996492
1981	62.61140176530314
1982	62.97232218864961
1983	63.2157593749811
1984	63.52021651796131
1985	63.81240262255821
1986	64.20835065275762
1987	64.51289390839285
1988	64.68498122844785
1989	65.02292628822602
1990	65.1885074558445
1991	65.33529375864678
1992	65.59648551324398
1993	65.78035307613769
1994	66.02536951644852
1995	66.2157756641036
1996	66.4801590543829
1997	66.82185012918286
1998	67.09683991065145
1999	67.38722653654123
2000	67.70052424109822
2001	68.05237150572788
2002	68.33338793034197
2003	68.6069221384269
2004	68.86237766296075
2005	69.19881209874619
2006	69.57129841886548
2007	69.83519377507928
2008	70.00607203893297
2009	70.4014786893824
2010	70.67112932660098
2011	71.00821736096977
2012	71.28424956061107
2013	71.57710090377107
2014	71.880681611011
2015	72.09417499926323
2016	72.34420066844628
2017	72.54135838501652
2018	72.78303635329232
2019	72.97902041767821
2020	72.24250459906702
2021	71.32715673746287
2022	71.99635238358407