1880    -0.342937
    1881    -0.240198
    1882    -0.290302
    1883    -0.349888
    1884    -0.450265
    1885    -0.501899
    1886    -0.516936
    1887    -0.573833
    1888    -0.397428
    1889    -0.252200
    1890    -0.503918
    1891    -0.422126
    1892    -0.548356
    1893    -0.483092
    1894    -0.486024
    1895    -0.437833
    1896    -0.337395
    1897    -0.309840
    1898    -0.485289
    1899    -0.345975
    1900    -0.236491
    1901    -0.278807
    1902    -0.473352
    1903    -0.545675
    1904    -0.612608
    1905    -0.415238
    1906    -0.359439
    1907    -0.514048
    1908    -0.482425
    1909    -0.586041
    1910    -0.490783
    1911    -0.565536
    1912    -0.546028
    1913    -0.471219
    1914    -0.261345
    1915    -0.287664
    1916    -0.471865
    1917    -0.576483
    1918    -0.382983
    1919    -0.338191
    1920    -0.282314
    1921    -0.290665
    1922    -0.341528
    1923    -0.318150
    1924    -0.354456
    1925    -0.294416
    1926    -0.164520
    1927    -0.291974
    1928    -0.309693
    1929    -0.443336
    1930    -0.245814
    1931    -0.117590
    1932    -0.198796
    1933    -0.366751
    1934    -0.166901
    1935    -0.255227
    1936    -0.156880
    1937    0.0261966
    1938   -0.0564394
    1939   -0.0824819
    1940  0.000718083
    1941   -0.0245785
    1942   -0.0488322
    1943     0.100949
    1944    0.0879738
    1945   -0.0915600
    1946    -0.142802
    1947    -0.100942
    1948    -0.192750
    1949    -0.194167
    1950    -0.262355
    1951    -0.120075
    1952   -0.0152451
    1953    0.0151718
    1954    -0.170080
    1955    -0.151613
    1956    -0.234010
    1957   -0.0144395
    1958   -0.0261313
    1959   -0.0454735
    1960   -0.0991497
    1961  -0.00935621
    1962   -0.0786559
    1963   -0.0446243
    1964    -0.301394
    1965    -0.179133
    1966    -0.109390
    1967   -0.0647903
    1968    -0.143708
    1969   -0.0180057
    1970   -0.0409980
    1971    -0.164899
    1972   -0.0674055
    1973    0.0859878
    1974    -0.132605
    1975   -0.0778050
    1976    -0.196605
    1977     0.150253
    1978    0.0335315
    1979    0.0901432
    1980     0.208927
    1981     0.289724
    1982    0.0587109
    1983     0.241341
    1984    0.0663431
    1985    0.0561525
    1986    0.0916898
    1987     0.230506
    1988     0.295415
    1989     0.177456
    1990     0.363017
    1991     0.345595
    1992     0.151160
    1993     0.182082
    1994     0.260228
    1995     0.402790
    1996     0.290498
    1997     0.427520
    1998     0.584896
    1999     0.331682
    2000     0.327439
    2001     0.488513
    2002     0.583941
    2003     0.559064
    2004     0.504548
    2005     0.643554
    2006     0.591298
    2007     0.625320
    2008     0.490724
    2009     0.628822
    2010     0.706313
    2011     0.574298
    2012     0.586751
    2013     0.644072
    2014     0.678687
    2015     0.824591
    2016     0.938453
    2017     0.847806
    2018     0.789144
    2019     0.931921
    2020     0.958575
    2021     0.801621
    2022     0.846954
    2023     0.849949