Hurrell SLP-based Northern Annular Mode Index (DJFM)
  1899   -0.36
  1900   -1.92
  1901    0.04
  1902   -0.56
  1903    1.64
  1904   -0.13
  1905    0.74
  1906    0.37
  1907    0.88
  1908    0.08
  1909   -0.74
  1910    0.26
  1911    0.51
  1912   -0.60
  1913    1.22
  1914    0.85
  1915   -0.94
  1916   -0.05
  1917   -0.80
  1918    0.05
  1919   -0.98
  1920    1.31
  1921    0.51
  1922    0.36
  1923    0.47
  1924   -0.83
  1925    0.82
  1926   -0.34
  1927    0.12
  1928    0.11
  1929   -0.83
  1930    0.49
  1931   -1.28
  1932    0.39
  1933   -0.47
  1934    0.66
  1935    0.41
  1936   -2.39
  1937    0.08
  1938    0.43
  1939   -0.17
  1940   -1.79
  1941   -1.14
  1942   -0.85
  1943    0.74
  1944    0.45
  1945   -0.78
  1946   -0.48
  1947   -2.00
  1948    0.68
  1949    1.26
  1950    0.37
  1951   -0.98
  1952   -0.03
  1953   -0.15
  1954    0.27
  1955   -1.06
  1956   -0.95
  1957   -0.11
  1958   -0.97
  1959    0.42
  1960   -1.53
  1961    0.30
  1962   -0.36
  1963   -0.70
  1964   -0.42
  1965   -0.79
  1966   -1.10
  1967    0.28
  1968    0.03
  1969   -2.51
  1970   -1.74
  1971   -0.62
  1972    0.13
  1973    1.24
  1974   -0.29
  1975    0.78
  1976    0.94
  1977   -1.82
  1978   -0.48
  1979   -0.94
  1980   -0.71
  1981   -0.11
  1982    0.19
  1983    0.66
  1984   -0.28
  1985   -0.99
  1986   -0.54
  1987   -0.77
  1988   -0.32
  1989    2.75
  1990    1.95
  1991    0.45
  1992    1.62
  1993    1.99
  1994    0.67
  1995    1.07
  1996   -1.10
  1997    1.13
  1998   -0.00
  1999    0.61
  2000    1.44
  2001   -0.75
  2002    1.22
  2003    0.25
  2004    0.10
  2005    0.02
  2006   -0.85
  2007    1.45
  2008    1.20
  2009    0.43
  2010   -2.50
  2011   -0.44
  2012    0.83
  2013   -1.31
  2014    0.76
  2015    1.58
  2016    0.50
  2017    1.36
  2018   -0.10
  2019    0.96
  2020    2.44
  2021   -0.57
  2022    1.15
  2023   -0.16