Year	years
1960	44.972898651669894
1961	45.67640149749665
1962	46.12257584528735
1963	46.97247170646677
1964	47.89575845641874
1965	48.2321074069176
1966	48.45707277658731
1967	48.912911191235914
1968	49.44511952130966
1969	49.82223582359719
1970	50.35134318137286
1971	51.29642393168458
1972	51.86445798833013
1973	52.53968339398722
1974	53.19444453097972
1975	53.70985801760173
1976	54.04753359018671
1977	55.361470341669744
1978	56.112173493827555
1979	56.82629234989416
1980	57.30237239117356
1981	57.692929471800205
1982	58.0547979155265
1983	58.787368432600054
1984	59.47897587708015
1985	60.21573678951583
1986	61.22126232817299
1987	61.16971172930249
1988	60.60902529817948
1989	62.48114365681431
1990	62.92796703295272
1991	63.1796143554706
1992	63.47441021041171
1993	64.45832147259863
1994	65.49672687220142
1995	65.34978333037773
1996	65.71840452297911
1997	65.99441940020867
1998	65.8077067945681
1999	66.87672731959469
2000	67.29733125523734
2001	67.6316805976471
2002	67.93557016325819
2003	67.85900283350051
2004	67.89591204418906
2005	68.16268217967931
2006	68.56724961180083
2007	68.92868036602279
2008	69.28642729404757
2009	69.81263770437707
2010	70.04125357145433
2011	70.26151981300228
2012	70.1804605984523
2013	70.19651371013074
2014	70.49262887112948
2015	70.75822222882107
2016	70.94306227819227
2017	71.4295960025113
2018	71.63301665494629
2019	71.84462602504462
2020	70.92335958723314
2021	70.81448302106303
2022	71.22727445474376