Year	years
1960	69.89299530787395
1961	70.36660805705415
1962	70.23125435579804
1963	70.04895071575281
1964	70.31258652779742
1965	70.36647617540788
1966	70.37643400357469
1967	70.71382320389363
1968	70.17584886699217
1969	70.69416501290208
1970	70.98528237051917
1971	71.29047685023241
1972	71.32595389346587
1973	71.52952958372288
1974	72.07966774549479
1975	72.69358819914389
1976	72.95296398048238
1977	73.34913401599302
1978	73.47003713884484
1979	73.90780934670785
1980	73.75503131746667
1981	74.15489713441438
1982	74.49424755234253
1983	74.61962760069581
1984	74.73659587609141
1985	74.73592873824987
1986	74.79563307846708
1987	74.96373994420152
1988	74.9725305107757
1989	75.22662686804576
1990	75.43630625792967
1991	75.58795167175282
1992	75.8378374089233
1993	75.64642149712768
1994	75.8426434629848
1995	75.85550696824188
1996	76.24444016020348
1997	76.62556280928477
1998	76.78245934960044
1999	76.80502400089208
2000	76.88515442538598
2001	77.0885956967303
2002	77.19229282160616
2003	77.30040777236897
2004	77.73477783145682
2005	77.74605793024656
2006	77.96879441311934
2007	78.2396063900185
2008	78.30377144140331
2009	78.65486419355847
2010	78.81720388470026
2011	78.92396965168993
2012	79.03287767252758
2013	79.0416976614745
2014	79.13625910988954
2015	79.00365825083149
2016	78.87973542455212
2017	78.8724748510911
2018	78.9658408891533
2019	79.14135663224654
2020	77.46271223118879
2021	76.87265827081391
2022	77.83875369590439