Year	years
1960	66.75193691642491
1961	67.21766854303242
1962	67.04166644646865
1963	66.76696115174455
1964	66.96999166116359
1965	66.9831813905081
1966	66.89476294640573
1967	67.18204048988022
1968	66.29574578668617
1969	67.02631616513249
1970	67.31324973500257
1971	67.61455140875293
1972	67.60421854802202
1973	67.80312035533287
1974	68.3517301008228
1975	68.91762390022872
1976	69.21874415088281
1977	69.61281817458438
1978	69.7306678577722
1979	70.13058109009623
1980	70.15759827602487
1981	70.55985283197133
1982	70.95196558741813
1983	71.16695623442354
1984	71.29005509512659
1985	71.29069009722396
1986	71.40042916703923
1987	71.61214941238482
1988	71.62092342585304
1989	71.9233463889948
1990	72.05216965220777
1991	72.25486515591118
1992	72.54709050305571
1993	72.45026641554419
1994	72.65383632795199
1995	72.75663578769287
1996	73.3326881749611
1997	73.81004710714166
1998	74.01567254046377
1999	74.12753847897186
2000	74.35060976291344
2001	74.55877599831683
2002	74.67359445133704
2003	74.7793304337233
2004	75.26540347965904
2005	75.2787669799438
2006	75.50548338384247
2007	75.77600353119647
2008	75.88827033607224
2009	76.28917686951371
2010	76.49968089816903
2011	76.60846026951032
2012	76.7212045426426
2013	76.73500874370495
2014	76.82761769923127
2015	76.65567784195778
2016	76.48499272182934
2017	76.4700921996714
2018	76.56770628734144
2019	76.69988245053676
2020	74.7450957395982
2021	74.09782003956732
2022	75.25396310700584