Year	years
1960	40.74320268298056
1961	41.071671970274906
1962	41.62237665312326
1963	41.76393400638191
1964	42.253055775010296
1965	42.401398566517535
1966	42.33486772330063
1967	42.976579370782495
1968	43.30820644319975
1969	43.56528346657549
1970	43.87857391382499
1971	44.223790242607215
1972	44.02369655049331
1973	44.76052282894577
1974	44.79944872176096
1975	45.1666195224371
1976	45.84417819976955
1977	46.212474584880056
1978	46.39335832235114
1979	46.80426001726009
1980	47.214725632848975
1981	47.51565661473694
1982	47.737663741172774
1983	46.52564001177554
1984	46.397441235739045
1985	46.76065819959353
1986	47.57774115764353
1987	48.30188300595508
1988	48.10638923331893
1989	49.17537501110079
1990	49.21020591692235
1991	49.20819670291272
1992	49.187801844134206
1993	49.79599985250528
1994	50.16104123290726
1995	50.66783570813712
1996	50.78845500003173
1997	51.136526791931146
1998	50.95230415305459
1999	51.8352413766677
2000	52.66175412095464
2001	53.13109920509466
2002	53.62999651695246
2003	54.229668876523945
2004	54.740409284175044
2005	55.40832281769307
2006	56.233620674672544
2007	56.88988798930103
2008	57.50407018553205
2009	58.24031169505169
2010	58.57768856792502
2011	59.47522039825314
2012	60.07801762292335
2013	60.64456075370131
2014	61.14707309305527
2015	61.61254772939035
2016	62.16196194022386
2017	62.54976046880772
2018	62.947575947408374
2019	63.33805694716437
2020	62.76172018146169
2021	62.30278539996223
2022	62.843246261160665