| Climatic event | Number of years | Years associated with the event |
| Drought | 13 | 1951, 1965, 1966, 1968, 1972, 1974, 1979, 1982, 1986, 1987, 2002, 2004, 2009 | Flood | 11 | 1953, 1956, 1958, 1959, 1961, 1964, 1970, 1975, 1983, 1988, 1994 | El-Niño | 23 | 1951, 1953, 1957, 1958, 1963, 1965, 1966, 1968, 1969, 1972, 1977, 1982, 1983, 1986, 1987, 1991, 1992, 1994, 1997, 2002, 2004, 2006, 2009 | La-Niña | 22 | 1950, 1954, 1955, 1956, 1964, 1970, 1971, 1973, 1974, 1975, 1984, 1985, 1988, 1989, 1995, 1998, 1999, 2000, 2007, 2008, 2010, 2011 | Positive IOD | 12 | 1957, 1961, 1963, 1967, 1972, 1977, 1982, 1983, 1994, 1997, 2006, 2007 | Negative IOD | 10 | 1958, 1960, 1964, 1971, 1974, 1975, 1989, 1992, 1993, 1996 |
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