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This DMI time series contains one value per year - and this is an average from 
June till November. This is for the period 1958 till 2006.  
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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 1958 /  1: -0.7989
 1959 /  2: -0.4807
 1960 /  3: -0.4959
 1961 /  4:  0.6788
 1962 /  5: -0.0941
 1963 /  6:  0.4598
 1964 /  7: -0.4521
 1965 /  8: -0.0273
 1966 /  9:  0.1412
 1967 / 10:  0.3643
 1968 / 11: -0.2169
 1969 / 12: -0.0696
 1970 / 13: -0.2296
 1971 / 14: -0.1795
 1972 / 15:  0.7767
 1973 / 16: -0.2322
 1974 / 17: -0.2560
 1975 / 18: -0.2077
 1976 / 19:  0.3166
 1977 / 20:  0.1314
 1978 / 21: -0.0790
 1979 / 22:  0.0281
 1980 / 23: -0.3825
 1981 / 24: -0.2880
 1982 / 25:  0.6000
 1983 / 26:  0.3293
 1984 / 27: -0.2473
 1985 / 28: -0.1246
 1986 / 29: -0.0445
 1987 / 30:  0.4469
 1988 / 31: -0.0542
 1989 / 32: -0.2070
 1990 / 33: -0.0719
 1991 / 34:  0.3729
 1992 / 35: -0.4315
 1993 / 36:  0.0670
 1994 / 37:  0.8100
 1995 / 38:  0.0314
 1996 / 39: -0.4816
 1997 / 40:  0.9179
 1998 / 41: -0.2257
 1999 / 42:  0.1754
 2000 / 43:  0.1745
 2001 / 44:  0.0305
 2002 / 45:  0.2647
 2003 / 46:  0.2310
 2004 / 47:  0.0621
 2005 / 48: -0.1276
 2006 / 49:  0.5324