Year	years
1960	45.93245360612968
1961	46.66480759417704
1962	46.99663276922007
1963	47.92410657724617
1964	48.559960648958466
1965	49.16958412642579
1966	49.75356780795171
1967	50.28723776713338
1968	50.68252557703438
1969	51.33990839041214
1970	51.93123095900361
1971	52.582163332112
1972	53.14512343011851
1973	53.96253454702556
1974	54.75795418653237
1975	55.521620334992804
1976	55.91370263661964
1977	57.173957821312996
1978	57.74075333732436
1979	59.08360167259814
1980	59.92114474010615
1981	60.57391277993667
1982	61.25740577033841
1983	62.76399560969955
1984	63.64532948090524
1985	64.45405746725886
1986	65.17337982245748
1987	65.64419843526049
1988	66.08482659429181
1989	66.41956840726077
1990	66.45777767940602
1991	67.59119801917562
1992	68.09251765752876
1993	68.37967080265227
1994	68.70589453130474
1995	69.02851669328147
1996	69.45836777989665
1997	69.75147303762807
1998	69.91686269499517
1999	70.39080762765784
2000	70.83804569186275
2001	71.16652090820821
2002	71.50957929764193
2003	71.41785211304281
2004	71.97760660076875
2005	72.32071421860132
2006	72.68533502512868
2007	73.01862022672003
2008	73.0714161449755
2009	73.33706325861858
2010	73.65710784194384
2011	73.94876909319184
2012	73.91568536458213
2013	73.99059855266866
2014	74.2462646571557
2015	74.46201660946298
2016	74.91614310308161
2017	75.4877692385437
2018	75.59141583206514
2019	75.64759842941321
2020	74.73285861371376
2021	74.42502293939584
2022	74.8163689566139