El Niño years since 1950 are: 1951, 1957-58, 1963, 1965, 1969, 1972, 1976-77, 1982-83, 1986-87, 1991-92, 1994-95, 1997-98 (the strongest in the past 50 years), 2002-03, 2004, 2006.

La Niña years include: 1950, 1954-56, 1962, 1964, 1968, 1970-71, 1973-76, 1984-85, 1988-89, 1995-96, 1998-2000, 2007-2009.