Hurrell SLP-based Northern Annular Mode Index (DJFM)
  1899   -0.37
  1900   -1.94
  1901    0.03
  1902   -0.57
  1903    1.64
  1904   -0.14
  1905    0.75
  1906    0.37
  1907    0.88
  1908    0.07
  1909   -0.76
  1910    0.25
  1911    0.50
  1912   -0.61
  1913    1.23
  1914    0.85
  1915   -0.96
  1916   -0.06
  1917   -0.81
  1918    0.04
  1919   -0.99
  1920    1.32
  1921    0.51
  1922    0.35
  1923    0.47
  1924   -0.84
  1925    0.82
  1926   -0.34
  1927    0.12
  1928    0.11
  1929   -0.84
  1930    0.49
  1931   -1.29
  1932    0.39
  1933   -0.48
  1934    0.67
  1935    0.41
  1936   -2.41
  1937    0.07
  1938    0.43
  1939   -0.17
  1940   -1.80
  1941   -1.15
  1942   -0.86
  1943    0.74
  1944    0.46
  1945   -0.78
  1946   -0.49
  1947   -2.02
  1948    0.68
  1949    1.26
  1950    0.36
  1951   -0.99
  1952   -0.04
  1953   -0.15
  1954    0.27
  1955   -1.08
  1956   -0.96
  1957   -0.12
  1958   -0.98
  1959    0.42
  1960   -1.55
  1961    0.30
  1962   -0.37
  1963   -0.70
  1964   -0.42
  1965   -0.80
  1966   -1.12
  1967    0.28
  1968    0.03
  1969   -2.54
  1970   -1.76
  1971   -0.63
  1972    0.13
  1973    1.25
  1974   -0.30
  1975    0.78
  1976    0.94
  1977   -1.83
  1978   -0.48
  1979   -0.96
  1980   -0.72
  1981   -0.11
  1982    0.18
  1983    0.67
  1984   -0.28
  1985   -1.01
  1986   -0.53
  1987   -0.77
  1988   -0.32
  1989    2.77
  1990    1.96
  1991    0.45
  1992    1.64
  1993    2.01
  1994    0.67
  1995    1.08
  1996   -1.10
  1997    1.14
  1998    0.00
  1999    0.61
  2000    1.46
  2001   -0.76
  2002    1.23
  2003    0.26
  2004    0.10
  2005    0.02
  2006   -0.86
  2007    1.46
  2008    1.21
  2009    0.42
  2010   -2.51
  2011   -0.44
  2012    0.84
  2013   -1.32
  2014    0.76
  2015    1.59
  2016    0.51
  2017    1.37
  2018   -0.11
  2019    0.97
  2020    2.46
  2021   -0.58
  2022    1.15
  2023   -0.17
  2024    0.06
  2025    0.26