Year	years
1960	44.81706734663071
1961	47.70234302100125
1962	51.509613710021625
1963	51.969795470539644
1964	52.534965917531736
1965	52.47236050732822
1966	53.14301034173887
1967	53.718549093046924
1968	54.46891073400013
1969	54.97350015882083
1970	55.280989152241155
1971	55.62075178367897
1972	56.60343402263269
1973	57.30379338239631
1974	57.898905659459345
1975	58.539711174277244
1976	59.14618443057601
1977	59.85370581575232
1978	60.43684828891796
1979	61.02608453513295
1980	61.57798375388417
1981	62.09853321021385
1982	62.57249897878976
1983	63.072387503866025
1984	63.493576499554166
1985	63.862314914280994
1986	64.28649934090545
1987	64.65121359462324
1988	64.9800837833457
1989	65.31233049170223
1990	65.56348087560872
1991	65.69386890462313
1992	66.13429587461306
1993	66.44617283141305
1994	66.64855862416448
1995	66.96790727867679
1996	67.19039522985854
1997	67.56424822472157
1998	67.98454016266618
1999	68.26613324431035
2000	68.64137787501987
2001	69.16401099116828
2002	69.51001071894342
2003	69.837931128106
2004	70.05991626245559
2005	70.50847553229272
2006	70.90206742604224
2007	71.18110125228944
2008	71.3239870396908
2009	71.76284455386174
2010	72.06592249874092
2011	72.42832602763731
2012	72.79349665517252
2013	73.12919743681917
2014	73.42266412151423
2015	73.68691790711372
2016	73.97035648651395
2017	74.24734869904339
2018	74.48521971187964
2019	74.68713096974585
2020	74.15308040424411
2021	73.06455410336036
2022	73.68898265017717