Hurrell PC-Based North Atlantic Oscillation Index (Annual)
  1899    -0.60
  1900    -0.39
  1901    -0.67
  1902    -1.26
  1903     0.55
  1904     0.69
  1905     0.75
  1906     0.22
  1907     0.38
  1908     0.64
  1909    -1.11
  1910    -0.22
  1911     0.93
  1912     0.27
  1913     1.77
  1914     1.44
  1915    -2.14
  1916    -0.39
  1917    -0.70
  1918     0.29
  1919    -0.34
  1920     1.27
  1921     1.38
  1922     0.70
  1923     0.73
  1924    -0.07
  1925     0.24
  1926    -0.24
  1927    -0.05
  1928     0.96
  1929     0.19
  1930     0.17
  1931    -0.62
  1932    -0.18
  1933    -0.48
  1934     0.74
  1935     0.07
  1936    -0.37
  1937    -0.40
  1938     1.71
  1939    -0.38
  1940    -1.30
  1941    -1.11
  1942    -0.72
  1943     1.05
  1944     0.11
  1945    -0.96
  1946     0.57
  1947    -1.17
  1948     0.74
  1949     0.94
  1950     0.14
  1951    -0.36
  1952    -1.43
  1953     0.84
  1954     0.66
  1955    -1.83
  1956    -0.09
  1957    -0.24
  1958    -1.91
  1959     0.47
  1960    -1.90
  1961     0.33
  1962    -0.55
  1963    -1.13
  1964    -0.00
  1965    -1.08
  1966    -1.84
  1967     1.15
  1968    -1.71
  1969    -1.81
  1970    -0.86
  1971    -0.38
  1972     0.95
  1973     0.22
  1974     0.68
  1975     0.55
  1976     0.69
  1977    -0.75
  1978    -0.28
  1979    -0.36
  1980    -1.08
  1981    -0.88
  1982     1.46
  1983     0.47
  1984     0.81
  1985    -1.28
  1986     1.30
  1987    -1.18
  1988     0.13
  1989     2.22
  1990     2.50
  1991     0.96
  1992     1.66
  1993     0.66
  1994     1.34
  1995    -0.80
  1996    -1.08
  1997     0.02
  1998    -0.27
  1999     0.58
  2000     0.66
  2001    -0.57
  2002     0.33
  2003     0.32
  2004     0.11
  2005    -0.71
  2006    -0.24
  2007     0.56
  2008     0.12
  2009    -0.74
  2010    -3.62
  2011     1.15
  2012    -0.50
  2013    -0.16
  2014     0.54
  2015     1.93
  2016     0.40
  2017     0.37
  2018     0.75
  2019    -0.66
  2020     1.51
  2021    -1.11
  2022     0.20