Hurrell PC-Based North Atlantic Oscillation Index (MAM)
  1899   -1.25
  1900   -0.38
  1901   -0.27
  1902   -0.49
  1903    1.02
  1904    1.33
  1905    0.58
  1906    0.14
  1907    0.30
  1908    0.49
  1909   -1.79
  1910    0.36
  1911    0.98
  1912    1.32
  1913    2.23
  1914    1.70
  1915   -1.13
  1916   -1.49
  1917   -1.60
  1918    0.58
  1919   -0.11
  1920    0.98
  1921    1.78
  1922    0.20
  1923    0.06
  1924   -2.08
  1925    0.30
  1926   -0.19
  1927    0.35
  1928   -0.60
  1929    0.09
  1930   -0.29
  1931   -1.28
  1932   -1.21
  1933   -0.79
  1934    0.96
  1935   -1.24
  1936   -0.34
  1937   -0.77
  1938    1.17
  1939    0.22
  1940   -1.32
  1941   -0.72
  1942   -0.83
  1943    1.91
  1944    0.05
  1945    0.19
  1946    0.38
  1947    0.28
  1948    1.39
  1949    0.53
  1950    0.35
  1951   -1.90
  1952   -1.58
  1953   -0.59
  1954   -0.35
  1955   -0.94
  1956    0.88
  1957   -1.07
  1958   -1.54
  1959    0.60
  1960   -0.89
  1961   -0.28
  1962   -1.75
  1963    0.39
  1964    0.08
  1965   -0.47
  1966   -0.56
  1967    1.23
  1968    0.22
  1969   -0.96
  1970   -0.48
  1971   -0.55
  1972    0.65
  1973   -0.29
  1974    0.01
  1975   -0.60
  1976    1.32
  1977    0.24
  1978    0.16
  1979   -0.32
  1980   -0.72
  1981   -0.95
  1982    1.39
  1983   -0.42
  1984   -0.68
  1985   -0.13
  1986    1.58
  1987    0.17
  1988   -0.87
  1989    1.48
  1990    2.40
  1991    0.11
  1992    1.39
  1993   -0.02
  1994    1.49
  1995   -0.76
  1996   -1.17
  1997    0.47
  1998    0.21
  1999   -0.46
  2000    0.21
  2001   -0.79
  2002    1.04
  2003    0.73
  2004    0.94
  2005   -1.33
  2006   -1.11
  2007    1.43
  2008   -1.06
  2009    1.23
  2010   -1.30
  2011    1.77
  2012    0.33
  2013   -1.70
  2014    0.77
  2015    2.25
  2016    0.34
  2017   -0.09
  2018    0.09
  2019    0.54
  2020    0.72
  2021   -0.22
  2022    0.24
  2023   -1.26
  2024   -1.02