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This DMI time series contains one value per year - and this is an average from 
June till October. This is for the period 1958 till 1999.  We filtered off 
periodicities longer than 7 years (the decadal component) before calculating 
the index. The DMI is the difference of SST anomaly between the

        western (50 E - 70 E, 10 S - 10 N)

                and

        eastern (90E - 110 E, 10 S - Equator)  Indian Ocean.

The values given here were normalized by the standard deviation of the DMI.  
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  Year    Value
   1958  -0.438061
   1959  -0.262484
   1960  -0.372913
   1961   0.688071
   1962  -0.183317
   1963   0.376565
   1964  -0.533300
   1965   -1.99373E-02
   1966   0.177544
   1967   0.425093
   1968    1.25660E-02
   1969  -0.147241
   1970  -0.426079
   1971  -0.398483
   1972   0.664254
   1973  -0.220716
   1974   -6.44312E-02
   1975  -0.216678
   1976   0.134352
   1977   0.378757
   1978    8.47251E-02
   1979    8.45996E-02
   1980  -0.163898
   1981  -0.145619
   1982   0.429451
   1983   0.410260
   1984  -0.238034
   1985  -0.211715
   1986   -4.61443E-02
   1987   0.167046
   1988   -2.05965E-03
   1989  -0.240778
   1990  -0.127458
   1991   0.251152
   1992  -0.559459
   1993    3.69789E-02
   1994    1.00999
   1995  -0.238498
   1996  -0.678326
   1997   0.489672
   1998  -0.273898
   1999   0.383169