Year	years
1960	44.62114933801577
1961	45.33694023472227
1962	45.610731155372434
1963	46.77159495383923
1964	47.44387580602521
1965	48.04629863288953
1966	48.55781965779742
1967	49.02891625109405
1968	49.453752599997856
1969	50.0577122093921
1970	50.629303447557625
1971	51.29751207668794
1972	51.86330947973145
1973	52.43405501710649
1974	53.24375653553508
1975	53.846006349484774
1976	54.281658444633266
1977	55.59957270985302
1978	56.13601604245527
1979	57.36474019739735
1980	57.71709364424082
1981	57.574552521243575
1982	58.049706816105676
1983	59.627497286312746
1984	60.93854199869379
1985	61.73435652295494
1986	62.306198301340274
1987	63.022849021655624
1988	63.39417594760988
1989	64.33416663489106
1990	64.35124668183163
1991	65.58270646227166
1992	66.15719948911143
1993	66.46992883964037
1994	66.6481408535372
1995	66.96619722403005
1996	67.35734455401546
1997	67.63385599392907
1998	67.85279909515859
1999	68.2834814735427
2000	68.64149747381033
2001	68.97329521757628
2002	69.32606751965128
2003	69.1433468828083
2004	69.6247662656893
2005	69.90737181919405
2006	70.09165495982103
2007	70.42584047921048
2008	70.68353986140755
2009	71.02221904673912
2010	71.27684185876792
2011	71.52285845816088
2012	71.37764714623262
2013	71.40574681282641
2014	71.70277902755363
2015	71.98618912427742
2016	72.2564883768439
2017	72.76700113975623
2018	72.98437341747486
2019	73.14391859259587
2020	72.17269699657263
2021	71.89987572574371
2022	72.29705086452137