Year	years
1960	36.115778785159506
1961	41.559240240721856
1962	49.07842054269822
1963	49.56670088582454
1964	50.27448037193183
1965	49.95944614449786
1966	51.32741176796455
1967	52.2238034579734
1968	52.686342288065916
1969	53.4071936530304
1970	54.100684799829956
1971	54.995939248789476
1972	55.56538168829152
1973	56.496514588095614
1974	57.05720742500269
1975	57.85231359429192
1976	58.69655932726434
1977	59.403578383820005
1978	59.99033689508266
1979	60.598141646564805
1980	61.134533793571094
1981	61.63929730183196
1982	62.11015131282741
1983	62.50086351616995
1984	62.906874620951804
1985	63.282217752785456
1986	63.588726286831104
1987	63.93521963126222
1988	64.19380509129222
1989	64.51947893959516
1990	64.7811719484266
1991	65.16724907029003
1992	65.64149261048442
1993	66.01007151777743
1994	66.385533390837
1995	66.75283198249939
1996	67.05025369074521
1997	67.44581805344266
1998	67.78277578642064
1999	68.12935559759832
2000	68.45388075964091
2001	68.82604786928873
2002	69.19653449265957
2003	69.49403107732833
2004	69.62825999149526
2005	70.12025350442661
2006	70.47452941005014
2007	70.69950514326581
2008	70.70889751370785
2009	71.17364797603338
2010	71.4094878635157
2011	71.66181441206489
2012	71.87043718165435
2013	72.09033551290327
2014	72.34567577432551
2015	72.55301072098906
2016	72.71493148122539
2017	72.65853734081031
2018	73.14309112821107
2019	73.36261978756846
2020	73.22936848436136
2021	72.84883597827407
2022	73.5632954189876