First International Mathematical Olympiad, 1959 Second International Mathematical Olympiad, 1960 Third International Mathematical Olympiad, 1961 Fourth International Mathematical Olympiad, 1962 Fifth International Mathematical Olympiad, 1963 Sixth International Mathematical Olympiad, 1964 Seventh International Mathematical Olympiad, 1965 Eighth International Mathematical Olympiad, 1966 Ninth International Mathematical Olympiad, 1967 Tenth International Mathematical Olympiad, 1968 Eleventh International Mathematical Olympiad, 1969 Twelfth International Mathematical Olympiad, 1970 Thirteenth International Mathematical Olympiad, 1971 Fourteenth International Mathematical Olympiad, 1972 Fifteenth International Mathematical Olympiad, 1973 Sixteenth International Mathematical Olympiad, 1974 Seventeenth International Mathematical Olympiad, 1975 Eighteenth International Mathematical Olympiad, 1976 Nineteenth International Mathematical Olympiad, 1977 Twentieth International Mathematical Olympiad, 1978 Twenty-first International Mathematical Olympiad, 1979 Twenty-second International Mathematical Olympiad, 1981 Twenty-third International Mathematical Olympiad, 1982 Twenty-fourth International Mathematical Olympiad, 1983 Twenty-fifth International Mathematical Olympiad, 1984 Twenty-sixth International Mathematical Olympiad, 1985 27th International Mathematical Olympiad, Warsaw, Poland,July 9, 1986 28th International Mathematical Olympiad, Havana, Cuba, July 10, 1987 29th International Mathematical Olympiad, Canberra, Australia 30th International Mathematical Olympiad, Braunschweig, Germany 31st International Mathematical Olympiad, Beijing, China, July 12, 1990 32nd International Mathematical Olympiad, July 17, 1991 33rd International Mathematical Olympiad, Moscow, July 15, 1992 34th International Mathematical Olympiad, July 18, 1993 35th International Mathematical Olympiad, Hong Kong, July 13-14, 1994 36th International Mathematical Olympiad, Toronto, July 19, 1995 37th International Mathematical Olympiad, Mumbai, India, July 10, 1996 38th International Mathematical Olympiad, Mar del Plata, Argentina, July 24, 1997 39th International Mathematical Olympiad, Taipei, Taiwan, July 15, 1998 40th International Mathematical Olympiad, Bucharest, July 16, 1999 41st International Mathematical Olympiad, 2000 42nd International Mathematical Olympiad, Washington, DC, United States of America, July 8–9, 2001 43rd International Mathematical Olympiad, 2002 44th International Mathematical Olympiad, 2003 45th International Mathematical Olympiad, 2004 46th International Mathematical Olympiad, 2005