Aleutian Low Pressure Index Anomaly
The ALPI anomaly is computed using a 1950-1997 mean 
area of 5,626,070 square kilometers 
  

Year  Anomaly (in 10^6 sq. km.) 
1899 -0.744 
1900 1.560 
1901 -0.205 
1902 -0.020 
1903 -4.590 
1904 0.046 
1905 -1.231 
1906 -0.283 
1907 -3.786 
1908 -1.782 
1909 0.096 
1910 -2.755 
1911 -2.395 
1912 -0.178 
1913 -1.390 
1914 0.615 
1915 -1.631 
1916 -2.429 
1917 -2.354 
1918 1.297 
1919 3.122 
1920 -2.341 
1921 -0.170 
1922 -3.194 
1923 -2.030 
1924 1.167 
1925 -0.758 
1926 4.341 
1927 1.203 
1928 1.155 
1929 1.555 
1930 -2.221 
1931 2.941 
1932 -2.348 
1933 -3.098 
1934 2.982 
1935 -1.090 
1936 2.741 
1937 -3.401 
1938 -0.301 
1939 0.584 
1940 6.573 
1941 5.714 
1942 2.143 
1943 -3.054 
1944 1.577 
1945 4.797 
1946 3.048 
1947 -2.280 
1948 -2.676 
1949 -1.104 
1950 -1.969 
1951 -1.437 
1952 -2.930 
1953 2.389 
1954 -2.408 
1955 -2.655 
1956 -3.973 
1957 -1.715 
1958 2.368 
1959 -2.192 
1960 -0.467 
1961 3.059 
1962 -1.807 
1963 2.506 
1964 0.726 
1965 -1.707 
1966 -1.802 
1967 -0.173 
1968 -0.332 
1969 -2.758 
1970 3.787 
1971 -2.344 
1972 -4.588 
1973 -1.930 
1974 1.052 
1975 -1.992 
1976 -1.165 
1977 3.079 
1978 2.347 
1979 -1.158 
1980 1.686 
1981 4.932 
1982 -3.410 
1983 7.145 
1984 1.533 
1985 -1.730 
1986 5.389 
1987 3.553 
1988 1.157 
1989 -2.718 
1990 -0.918 
1991 0.363 
1992 2.088 
1993 -1.101 
1994 -0.635 
1995 1.515 
1996 0.799 
1997 0.538 
1998 4.707 
1999 
2000