Year	years
1960	59.552734592702144
1961	59.860676196146926
1962	60.19852132001163
1963	60.38462426828502
1964	60.898087398146174
1965	61.47357033839019
1966	61.68772155251353
1967	61.923019855674255
1968	62.19498141259683
1969	62.368401442755335
1970	62.81336937084595
1971	63.16723984386167
1972	63.504595028408964
1973	63.75588399328457
1974	63.86600543520724
1975	63.476377749969885
1976	63.95114716229213
1977	64.11953325444608
1978	64.04247997561703
1979	64.35200451470841
1980	65.44225612515882
1981	65.63427333601425
1982	65.9284795264754
1983	66.20094956986753
1984	66.76833996675884
1985	67.06610299302915
1986	67.32896947798376
1987	67.7851843615894
1988	68.11180251064918
1989	68.28185327795669
1990	68.54483872102684
1991	68.64958830562341
1992	68.68061673716946
1993	68.73368641846037
1994	68.29871696580054
1995	68.6412562589437
1996	68.80313531874367
1997	68.87919767483719
1998	68.69070035774683
1999	68.4542480233473
2000	69.43557417378726
2001	69.75335539838306
2002	69.92597158046017
2003	69.96908227575499
2004	70.29564448707549
2005	70.53389432740626
2006	70.84693376043184
2007	71.30466444555074
2008	71.6601390440902
2009	72.08812732352118
2010	72.67931406778443
2011	73.126797013982
2012	73.47226485537286
2013	73.92108895366256
2014	74.3716311428494
2015	74.68834923713626
2016	75.05513419567755
2017	75.48084401562969
2018	75.63452619738656
2019	75.86755301976325
2020	75.7238950781155
2021	74.8828022456099
2022	75.33616421763348