Year	years
1960	53.718132228866125
1961	54.20729392857625
1962	54.59943588206694
1963	54.53505181772352
1964	55.19509074514987
1965	55.963434549110865
1966	56.22191801236695
1967	56.41864001431598
1968	56.66514637750816
1969	56.79441923592754
1970	57.16017787008232
1971	57.44855706326682
1972	57.78214934359062
1973	58.20858293656207
1974	56.19643529573603
1975	57.19756015095588
1976	57.54307754245129
1977	57.82507613633827
1978	57.80408374481673
1979	58.148277221250744
1980	58.8814667368853
1981	59.3572314783794
1982	59.66495187585558
1983	59.90546421734789
1984	60.44789013253111
1985	60.769899647988936
1986	61.2365222731759
1987	61.791027130652125
1988	61.98550701989377
1989	63.042326601801946
1990	62.947222313421044
1991	62.901698159822324
1992	62.879985256197145
1993	63.04226167149118
1994	62.84179965397136
1995	62.85072757699456
1996	63.29464685385468
1997	63.250326655862864
1998	63.17934329896567
1999	63.000184543017475
2000	64.52166616685008
2001	64.7491581194235
2002	64.90178127362402
2003	65.255287529458
2004	65.51106856779259
2005	65.90773222518393
2006	66.24221879658592
2007	66.63924452612633
2008	67.14993494819458
2009	67.6711698788984
2010	68.21228702475155
2011	68.56631708241152
2012	69.03218390676588
2013	69.49018751036354
2014	69.75927312623169
2015	70.15889608006857
2016	70.46543744102539
2017	70.81945640853107
2018	71.10901866390812
2019	71.33222194168023
2020	70.91928632978205
2021	70.1609581117454
2022	70.6968186579834