Year	years
1960	44.428213837911656
1961	44.74394020573234
1962	45.118164640282245
1963	45.43169660075328
1964	45.837887652133304
1965	44.96178537889861
1966	45.56138901581062
1967	45.99855385293006
1968	47.492178518089176
1969	47.902162010350885
1970	47.62234995854185
1971	46.94533844338475
1972	49.01131409108227
1973	49.47292252447002
1974	49.986990514497
1975	50.66026331011052
1976	51.258765502639086
1977	51.8892582723269
1978	52.53662030818085
1979	53.20198487683205
1980	53.89142369790693
1981	54.57210729620151
1982	55.19792998357264
1983	55.83345840388473
1984	56.40018827040092
1985	56.87073223955382
1986	57.3926899977338
1987	57.86166176756961
1988	58.399174438873175
1989	58.808577615206126
1990	59.35401348107285
1991	59.537268071583725
1992	60.16345958532725
1993	60.421510534592386
1994	60.817355605828475
1995	61.152424995917144
1996	61.49395444499785
1997	62.12052882948353
1998	62.778021035238616
1999	63.45717184002961
2000	63.88358919741668
2001	64.38300858428926
2002	64.93722477333219
2003	65.47071515150226
2004	65.90128225645667
2005	66.38425910013154
2006	66.97098728542812
2007	67.32334961135003
2008	67.7593940127856
2009	68.06750795106164
2010	68.6037860135185
2011	68.9987556593466
2012	69.51099570426544
2013	70.01083774702954
2014	70.40086750581276
2015	70.82718151874538
2016	71.25024937315732
2017	71.64467020647588
2018	71.91581675024955
2019	72.20045891048083
2020	71.61330381964592
2021	69.43207064892441
2022	70.0557324026669