Hurrell PC-Based North Atlantic Oscillation Index (MAM)
  1899   -1.26
  1900   -0.40
  1901   -0.28
  1902   -0.50
  1903    1.03
  1904    1.33
  1905    0.56
  1906    0.13
  1907    0.29
  1908    0.48
  1909   -1.79
  1910    0.35
  1911    0.97
  1912    1.32
  1913    2.23
  1914    1.70
  1915   -1.15
  1916   -1.50
  1917   -1.62
  1918    0.56
  1919   -0.12
  1920    0.97
  1921    1.78
  1922    0.19
  1923    0.05
  1924   -2.09
  1925    0.30
  1926   -0.21
  1927    0.34
  1928   -0.60
  1929    0.07
  1930   -0.30
  1931   -1.29
  1932   -1.22
  1933   -0.81
  1934    0.97
  1935   -1.26
  1936   -0.34
  1937   -0.78
  1938    1.15
  1939    0.21
  1940   -1.33
  1941   -0.74
  1942   -0.84
  1943    1.90
  1944    0.03
  1945    0.17
  1946    0.37
  1947    0.27
  1948    1.38
  1949    0.52
  1950    0.33
  1951   -1.90
  1952   -1.59
  1953   -0.61
  1954   -0.35
  1955   -0.96
  1956    0.86
  1957   -1.08
  1958   -1.54
  1959    0.59
  1960   -0.90
  1961   -0.29
  1962   -1.76
  1963    0.39
  1964    0.08
  1965   -0.48
  1966   -0.56
  1967    1.23
  1968    0.21
  1969   -0.97
  1970   -0.49
  1971   -0.55
  1972    0.65
  1973   -0.30
  1974   -0.00
  1975   -0.61
  1976    1.31
  1977    0.22
  1978    0.15
  1979   -0.31
  1980   -0.73
  1981   -0.96
  1982    1.39
  1983   -0.41
  1984   -0.68
  1985   -0.14
  1986    1.58
  1987    0.17
  1988   -0.87
  1989    1.48
  1990    2.39
  1991    0.10
  1992    1.39
  1993   -0.02
  1994    1.48
  1995   -0.76
  1996   -1.17
  1997    0.45
  1998    0.21
  1999   -0.46
  2000    0.21
  2001   -0.79
  2002    1.04
  2003    0.72
  2004    0.94
  2005   -1.33
  2006   -1.12
  2007    1.41
  2008   -1.06
  2009    1.23
  2010   -1.32
  2011    1.76
  2012    0.32
  2013   -1.70
  2014    0.77
  2015    2.23
  2016    0.34
  2017   -0.10
  2018    0.10
  2019    0.53
  2020    0.70
  2021   -0.23
  2022    0.23
  2023   -1.27