Hurrell PC-Based North Atlantic Oscillation Index (MAM)
  1899    -1.28
  1900    -0.41
  1901    -0.29
  1902    -0.52
  1903     1.01
  1904     1.32
  1905     0.56
  1906     0.11
  1907     0.28
  1908     0.47
  1909    -1.81
  1910     0.33
  1911     0.96
  1912     1.31
  1913     2.23
  1914     1.69
  1915    -1.16
  1916    -1.53
  1917    -1.63
  1918     0.56
  1919    -0.13
  1920     0.97
  1921     1.77
  1922     0.18
  1923     0.04
  1924    -2.10
  1925     0.27
  1926    -0.21
  1927     0.34
  1928    -0.62
  1929     0.06
  1930    -0.31
  1931    -1.30
  1932    -1.25
  1933    -0.80
  1934     0.94
  1935    -1.27
  1936    -0.36
  1937    -0.79
  1938     1.14
  1939     0.20
  1940    -1.34
  1941    -0.76
  1942    -0.84
  1943     1.90
  1944     0.03
  1945     0.17
  1946     0.35
  1947     0.27
  1948     1.38
  1949     0.51
  1950     0.32
  1951    -1.93
  1952    -1.60
  1953    -0.62
  1954    -0.36
  1955    -0.96
  1956     0.86
  1957    -1.08
  1958    -1.56
  1959     0.59
  1960    -0.90
  1961    -0.29
  1962    -1.77
  1963     0.38
  1964     0.08
  1965    -0.49
  1966    -0.57
  1967     1.21
  1968     0.19
  1969    -0.98
  1970    -0.51
  1971    -0.57
  1972     0.64
  1973    -0.31
  1974    -0.01
  1975    -0.63
  1976     1.30
  1977     0.22
  1978     0.14
  1979    -0.33
  1980    -0.75
  1981    -0.97
  1982     1.37
  1983    -0.44
  1984    -0.71
  1985    -0.16
  1986     1.57
  1987     0.15
  1988    -0.89
  1989     1.47
  1990     2.38
  1991     0.09
  1992     1.38
  1993    -0.04
  1994     1.47
  1995    -0.77
  1996    -1.19
  1997     0.45
  1998     0.19
  1999    -0.47
  2000     0.19
  2001    -0.80
  2002     1.04
  2003     0.72
  2004     0.93
  2005    -1.35
  2006    -1.13
  2007     1.42
  2008    -1.07
  2009     1.22
  2010    -1.32
  2011     1.76
  2012     0.31
  2013    -1.71
  2014     0.77
  2015     2.23
  2016     0.32
  2017    -0.10
  2018     0.09
  2019     0.53
  2020     0.70
  2021    -0.23
  2022     0.23