- 33rd session, Nairobi, 23-26 October 2007
- 32nd session, Thessaloniki, 26-29 September 2006
- 31th session, Washington DC, 11-14 October 2005
- 30th session, Vienna, 23 August 2004
- 29th session, Geneva and Lausanne, 12-15 May 2003
- 28th session, Rome, 22-25 October 2002
- 27th session, New York, 18-21 June 2001
- 26th session, Sevilla, 25 September 2000
- 25th session, Brussels, 17-21 May 1999
- 24th session, Washington D.C., 22-28 June 1998
- 23rd session, Paris, 28 July -1 August 1997
- 22nd session, Beijing, 2-7 September 1996
- 21st session, New York, 5-9 June 1995
- 20th session, Florence, 19-21 September 1994
- 19th session, London, 27 September - 1 October 1993
- 18th session, Montreal, 6-11 September 1992
- 17th session, Rome, 11-13 September 1991
- 16th session, Geneva, 3-5 September 1990
- 15th session, Vienna, 12-14 September 1989
- 14th session, Paris, 22-25 August 1988
- 13th session, Washington D.C., 7-9 October 1987
- 12th session, Geneva, 2-4 September 1986
- 11th session, Paris, 12-14 November 1985
- 10th session, Bonn, 15-16 September 1984
- 9th session, Strasbourg, 28-30 June 1983
- 8th session, New York, 4-6 May 1982
- 7th session, Rome, 9-11 March 1981
- 6th session, London, 15 September 1980
- 5th session, Brussels, 16-18 June 1980
- 4th session, Geneva, 10-12 September 1979
- 3rd session, Geneva, 2-4 October 1978
- 2nd session, Geneva, 30 September 1977
- 1st session, Washington D.C., 29-30 September 1976
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