Year	years
1960	55.92668863015541
1961	56.723147441911735
1962	57.55657510261113
1963	58.291813763835435
1964	58.56992532569721
1965	59.75856799677115
1966	60.35692309934758
1967	60.94911577068673
1968	61.52896408306392
1969	61.925163474249956
1970	62.40656316015184
1971	62.8350144236247
1972	63.19103127978263
1973	63.21204773410299
1974	63.771543945576916
1975	63.82142197842687
1976	64.57019443714867
1977	64.84218899715331
1978	65.3386011865916
1979	65.75569445175896
1980	65.81415448661677
1981	65.96453936780772
1982	66.19138032417976
1983	66.66217840604597
1984	67.14461057019847
1985	67.56895993168715
1986	67.72401599723044
1987	68.01479898741472
1988	68.35603366281775
1989	68.4638518154591
1990	68.72381873572499
1991	68.80596548460973
1992	68.97219551329198
1993	69.09400706822714
1994	69.29031849833417
1995	69.51535805859915
1996	69.59909709300072
1997	69.68304869182732
1998	69.89116764737818
1999	69.92959646555687
2000	69.89301774339806
2001	69.92957449516392
2002	69.64921673221113
2003	69.92187200630902
2004	70.03555515934302
2005	70.14119741093634
2006	70.22192417693172
2007	70.15066507718345
2008	70.33150244256994
2009	70.17888097441809
2010	70.56061292334837
2011	70.7084790521307
2012	70.70220843507175
2013	70.75367065652193
2014	70.75476329971018
2015	70.70235097915341
2016	70.89424300130275
2017	71.17832724888002
2018	71.26162342902907
2019	71.3253170902613
2020	71.37340810636216
2021	71.20008602913511
2022	71.85068033105394