Year	years
1960	46.08256163154887
1961	47.35296881573248
1962	47.72240419527279
1963	48.07905137696079
1964	48.722777089289025
1965	49.33745298059658
1966	50.447382952655566
1967	50.985905657947065
1968	51.39889704324681
1969	52.05905810452625
1970	52.66791820783549
1971	53.34377649577017
1972	53.894179919123204
1973	54.744793368856286
1974	55.54285651936917
1975	56.31579812713935
1976	56.75450747748448
1977	57.95859091572013
1978	58.554677202201376
1979	59.840744612425425
1980	60.684396265449564
1981	61.33353585484996
1982	61.99857843234417
1983	63.43136436465703
1984	64.2862500446787
1985	65.07818971211444
1986	65.7668479777332
1987	66.24440656256817
1988	66.64951382621582
1989	67.0565985217515
1990	67.09742315131271
1991	68.16186735295967
1992	68.66260228952824
1993	68.96560880707858
1994	69.2980548895294
1995	69.60574031271292
1996	70.0336700870516
1997	70.32067099350859
1998	70.49337775546994
1999	70.95952170269533
2000	71.40113873964503
2001	71.72461007891202
2002	72.06374393318735
2003	72.01882243526696
2004	72.58351616069
2005	72.91249829551455
2006	73.2729595578999
2007	73.59595748899633
2008	73.68717638475135
2009	73.95348989842545
2010	74.30377683336806
2011	74.5885581881081
2012	74.59110921685713
2013	74.68923966200164
2014	74.93627217439392
2015	75.14226974616746
2016	75.56219633241247
2017	76.08603902774604
2018	76.19428399510129
2019	76.24640162107052
2020	75.32168170351457
2021	75.0848683994328
2022	75.5164789063311