Year	years
1960	44.62114933801577
1961	45.33694023472228
1962	45.61073115537241
1963	46.77159495383925
1964	47.443875806025204
1965	48.04629863288955
1966	48.557819657797424
1967	49.02891625109405
1968	49.45375259999787
1969	50.05771220939211
1970	50.62930344755763
1971	51.297512076687944
1972	51.863309479731456
1973	52.43405501710649
1974	53.24375653553508
1975	53.846006349484774
1976	54.28165844463327
1977	55.59957270985302
1978	56.13601604245527
1979	57.36474019739737
1980	57.71709364424083
1981	57.574552521243575
1982	58.04970681610567
1983	59.627497286312746
1984	60.9385419986938
1985	61.73435652295494
1986	62.306198301340274
1987	63.022849021655624
1988	63.39417594760989
1989	64.33416663489105
1990	64.32000573503255
1991	65.55854402918055
1992	66.13515514008148
1993	66.44784335452457
1994	66.62188673358526
1995	66.9399820546723
1996	67.33045613724897
1997	67.60563056104932
1998	67.82423611595998
1999	68.25689501632309
2000	68.62333389324165
2001	68.96373624030834
2002	69.30874848869513
2003	69.1230574789837
2004	69.60811601535512
2005	69.88413732115588
2006	70.0719112166503
2007	70.40701384924307
2008	70.6645249982073
2009	71.00465042818414
2010	71.25758184250935
2011	71.50354786792096
2012	71.3540519418564
2013	71.37597721520234
2014	71.69231407034749
2015	71.95855146640594
2016	72.23013227963254
2017	72.74322854556864
2018	72.96338905762993
2019	73.11939012664116
2020	72.14637619842054
2021	71.8811305367081
2022	72.28325411622335