Hurrell PC-Based North Atlantic Oscillation Index (Annual)
  1899   -0.59
  1900   -0.39
  1901   -0.66
  1902   -1.26
  1903    0.56
  1904    0.69
  1905    0.75
  1906    0.23
  1907    0.39
  1908    0.64
  1909   -1.10
  1910   -0.21
  1911    0.93
  1912    0.28
  1913    1.77
  1914    1.44
  1915   -2.12
  1916   -0.38
  1917   -0.69
  1918    0.30
  1919   -0.33
  1920    1.27
  1921    1.38
  1922    0.71
  1923    0.73
  1924   -0.06
  1925    0.24
  1926   -0.23
  1927   -0.05
  1928    0.97
  1929    0.19
  1930    0.17
  1931   -0.61
  1932   -0.18
  1933   -0.47
  1934    0.74
  1935    0.07
  1936   -0.36
  1937   -0.40
  1938    1.70
  1939   -0.37
  1940   -1.29
  1941   -1.10
  1942   -0.71
  1943    1.05
  1944    0.11
  1945   -0.96
  1946    0.57
  1947   -1.17
  1948    0.74
  1949    0.94
  1950    0.15
  1951   -0.36
  1952   -1.42
  1953    0.84
  1954    0.66
  1955   -1.82
  1956   -0.09
  1957   -0.24
  1958   -1.90
  1959    0.47
  1960   -1.89
  1961    0.33
  1962   -0.55
  1963   -1.12
  1964    0.00
  1965   -1.07
  1966   -1.83
  1967    1.15
  1968   -1.70
  1969   -1.81
  1970   -0.86
  1971   -0.38
  1972    0.95
  1973    0.22
  1974    0.68
  1975    0.54
  1976    0.69
  1977   -0.75
  1978   -0.28
  1979   -0.36
  1980   -1.07
  1981   -0.87
  1982    1.45
  1983    0.47
  1984    0.80
  1985   -1.27
  1986    1.30
  1987   -1.18
  1988    0.13
  1989    2.22
  1990    2.49
  1991    0.95
  1992    1.65
  1993    0.66
  1994    1.33
  1995   -0.80
  1996   -1.07
  1997    0.02
  1998   -0.28
  1999    0.58
  2000    0.65
  2001   -0.57
  2002    0.33
  2003    0.31
  2004    0.11
  2005   -0.71
  2006   -0.24
  2007    0.56
  2008    0.12
  2009   -0.74
  2010   -3.60
  2011    1.14
  2012   -0.50
  2013   -0.17
  2014    0.54
  2015    1.92
  2016    0.40
  2017    0.36
  2018    0.74
  2019   -0.66
  2020    1.50
  2021   -1.11