Year	years
1960	40.24757760235954
1961	40.630545367759886
1962	41.16885308301329
1963	41.29312851982853
1964	41.99125224178472
1965	41.98049507764259
1966	42.3904446955935
1967	42.94546440102468
1968	43.30486782339729
1969	43.540718049974075
1970	42.30743858689001
1971	37.759977774678546
1972	43.94637238523183
1973	44.55784935257032
1974	44.52761530923414
1975	44.552839059972875
1976	45.19074275281165
1977	45.79883566569516
1978	46.02614328970867
1979	46.49827022371203
1980	46.95139687031454
1981	47.29378635339439
1982	47.52229302078566
1983	46.80264219345937
1984	46.722285908968956
1985	47.07867770476326
1986	47.7084947584482
1987	48.22045346078462
1988	48.063124298964254
1989	49.21857108158381
1990	49.47938233795382
1991	49.23531763466743
1992	49.79528842375088
1993	50.33865976044954
1994	51.090650700568816
1995	51.57359662880115
1996	51.78720976839244
1997	52.35838778598118
1998	52.4782722155186
1999	53.80728562679256
2000	54.51015190895573
2001	54.94897970719452
2002	55.34511144324306
2003	55.87438664668234
2004	56.362970156630475
2005	56.818813522995136
2006	57.40729375681067
2007	57.78884976053766
2008	57.95995357261733
2009	58.82946729609001
2010	59.24673657038975
2011	59.88738298288758
2012	60.33517003198286
2013	60.60359450156227
2014	61.05151258402232
2015	61.38262689069334
2016	61.855365250612195
2017	62.25215789684938
2018	62.61604781219843
2019	62.87573595955123
2020	62.385980953165806
2021	61.88796600322135
2022	62.53869877398456