Year	years
1960	43.325090725528696
1961	44.010206163981444
1962	44.409726325451935
1963	45.39347685150706
1964	46.36861910526487
1965	46.68458044266135
1966	46.856743273322905
1967	47.25104523309334
1968	47.83725583459118
1969	48.163572836583704
1970	48.70413647130506
1971	49.682731629910286
1972	50.26710897864041
1973	50.84830772530231
1974	51.54952787896497
1975	51.95617933735132
1976	52.377482046763916
1977	53.736279186733206
1978	54.47925943318537
1979	55.18031655180769
1980	55.41726491680924
1981	55.678317980665724
1982	55.92042701276114
1983	56.6460466787608
1984	57.34073661471009
1985	58.08393924989044
1986	58.94597886522977
1987	58.934014315196016
1988	58.24167875853867
1989	60.4168536274542
1990	60.83449477145144
1991	61.2571484976589
1992	61.59868189823465
1993	62.576984898727645
1994	63.7105519963085
1995	63.426871979956644
1996	63.83793094673802
1997	64.09031693344149
1998	63.881163515724204
1999	65.0773565638944
2000	65.42538680875262
2001	65.76819991382179
2002	66.05959811040817
2003	65.88867340943733
2004	65.83818101173354
2005	66.07524457362692
2006	66.45136397070497
2007	66.82295242311513
2008	67.30176004862759
2009	67.90172268587281
2010	68.14341185757839
2011	68.35467226009004
2012	68.19819209429055
2013	68.16905025758487
2014	68.45360404457486
2015	68.80646768348508
2016	68.86461346474466
2017	69.33365975257307
2018	69.60939620510314
2019	69.90696576423151
2020	68.9362228892435
2021	68.83243331785962
2022	69.25703176189923