Year	years
1960	56.98985918611615
1961	57.54862194787619
1962	58.01254937173683
1963	58.46095472508464
1964	58.97355359182776
1965	59.425755627042356
1966	59.82975423584859
1967	60.24119204657744
1968	60.65403018544037
1969	61.0182551209888
1970	61.04455917994101
1971	61.943923332342536
1972	62.35437466091401
1973	62.951131101129015
1974	63.37647588211212
1975	63.99019623570611
1976	64.25913103657255
1977	64.95606176773789
1978	65.40981852317046
1979	65.8238887909342
1980	66.26300823263759
1981	66.84140808412467
1982	67.2114795089437
1983	67.73767297844785
1984	68.1718252974203
1985	68.43162328497203
1986	69.07636933407137
1987	69.54610882322002
1988	69.97708326521804
1989	70.41024666555337
1990	70.81919332865259
1991	71.20078105716095
1992	71.5512936933443
1993	71.89725307699509
1994	72.24921650183826
1995	72.60168961072677
1996	72.9706889857776
1997	73.34046562805219
1998	73.55755491846695
1999	73.97563304725266
2000	74.43070368736163
2001	74.71025951797009
2002	75.0407605373329
2003	75.13903168795498
2004	75.47588290618695
2005	75.81135812485512
2006	76.01814312663942
2007	76.1549162758344
2008	76.36098178605539
2009	76.5409742362351
2010	76.41408008316188
2011	76.90463109095138
2012	77.15963756501147
2013	77.35345918462738
2014	77.5216179254434
2015	77.63373362189937
2016	77.68316993256178
2017	77.75886015167873
2018	77.90376003140156
2019	78.11515099643347
2020	76.49814383464684
2021	75.63956152516377
2022	76.82881661657845