Year	years
1960	41.932149790433144
1961	46.45795784695048
1962	52.54846136023212
1963	53.142541091064984
1964	53.787583443509774
1965	53.80198856676049
1966	54.779226082433
1967	55.5173469769813
1968	56.055459677753795
1969	56.60648192694119
1970	57.209282271199484
1971	58.03355897920442
1972	58.71464377830671
1973	59.4838928297451
1974	60.1076305682931
1975	60.727454606905034
1976	61.39221803062353
1977	62.021890779978925
1978	62.54305441585065
1979	63.120953745113944
1980	63.608778674744606
1981	64.03985475025452
1982	64.5155833579602
1983	65.00281682686713
1984	65.46387536731825
1985	65.85675881573735
1986	66.30666478771246
1987	66.65671581837351
1988	66.91301247019899
1989	67.27009714699463
1990	67.43347405080236
1991	67.69250876308887
1992	68.10829900905446
1993	68.46142740879864
1994	68.74392027115863
1995	69.07923744898414
1996	69.35327994476502
1997	69.71124317081743
1998	70.10326800806556
1999	70.31627253299074
2000	70.68465927542053
2001	71.18969047493853
2002	71.49580682213512
2003	71.73397095903161
2004	71.8969323792615
2005	72.36715299498492
2006	72.6987776793454
2007	72.94776619195979
2008	73.11780999434924
2009	73.52450016074542
2010	73.79280897673155
2011	74.08269707896225
2012	74.3860750479773
2013	74.665309713948
2014	74.93692765301519
2015	75.14352788827692
2016	75.32332273568113
2017	75.46866926981716
2018	75.83723226460744
2019	76.04009150734498
2020	75.25385518504727
2021	74.89401587935987
2022	75.69569211262545