Hurrell PC-Based North Atlantic Oscillation Index (MAM)
  1899   -1.27
  1900   -0.41
  1901   -0.29
  1902   -0.51
  1903    1.02
  1904    1.32
  1905    0.56
  1906    0.11
  1907    0.29
  1908    0.47
  1909   -1.80
  1910    0.33
  1911    0.95
  1912    1.31
  1913    2.22
  1914    1.69
  1915   -1.15
  1916   -1.52
  1917   -1.62
  1918    0.56
  1919   -0.12
  1920    0.97
  1921    1.76
  1922    0.18
  1923    0.04
  1924   -2.09
  1925    0.28
  1926   -0.21
  1927    0.34
  1928   -0.61
  1929    0.06
  1930   -0.31
  1931   -1.29
  1932   -1.24
  1933   -0.80
  1934    0.94
  1935   -1.26
  1936   -0.36
  1937   -0.78
  1938    1.14
  1939    0.20
  1940   -1.33
  1941   -0.75
  1942   -0.84
  1943    1.89
  1944    0.03
  1945    0.17
  1946    0.35
  1947    0.27
  1948    1.37
  1949    0.51
  1950    0.33
  1951   -1.91
  1952   -1.59
  1953   -0.61
  1954   -0.36
  1955   -0.96
  1956    0.85
  1957   -1.08
  1958   -1.55
  1959    0.59
  1960   -0.89
  1961   -0.29
  1962   -1.76
  1963    0.38
  1964    0.08
  1965   -0.48
  1966   -0.57
  1967    1.21
  1968    0.19
  1969   -0.98
  1970   -0.50
  1971   -0.57
  1972    0.64
  1973   -0.31
  1974   -0.01
  1975   -0.62
  1976    1.30
  1977    0.22
  1978    0.14
  1979   -0.33
  1980   -0.75
  1981   -0.97
  1982    1.37
  1983   -0.43
  1984   -0.70
  1985   -0.15
  1986    1.57
  1987    0.15
  1988   -0.88
  1989    1.46
  1990    2.37
  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   -0.79
  2002    1.03
  2003    0.71
  2004    0.92
  2005   -1.34
  2006   -1.12
  2007    1.41
  2008   -1.07
  2009    1.22
  2010   -1.32
  2011    1.76
  2012    0.31
  2013   -1.70
  2014    0.77
  2015    2.23
  2016    0.32
  2017   -0.10
  2018    0.09
  2019    0.53
  2020    0.70
  2021   -0.23