Table 1.

The list of El Nino and La Nina Years during 1951-2010

El Nino			La Nina
Weak	Mod	Strong	Weak	Mod	Strong
1951	1986	1957	1950	1954	1955
1963	1987	1965	1956	1964	1973
1968	1994	1972	1962	1970	1975
1969	2002	1982	1967	1998	1988
1976		1991	1971	1999	2010
1977		1997	1974	2007
2004		2009	1984
2006			1995
			2000
			2011

Source: http://ggweather.com/enso/oni.htm.