01 January 1993
Adopted by the Fifteenth International Conference of Labour Statisticians (January 1993)
01 November 1987
Adopted by the Fourteenth International Conference of Labour Statisticians (October-November 1987)
01 January 1987
Adopted by the Fourteenth International Conference of Labour Statisticians (October-November 1987)
01 October 1982
Adopted by the Thirteenth International Conference of Labour Statisticians (October 1982)
01 October 1973
Adopted by the Twelfth International Conference of Labour Statisticians (October 1973)
01 October 1973
Adopted by the Twelfth International Conference of Labour Statisticians (October 1973)
01 October 1966
Adopted by the Eleventh International Conference of Labour Statisticians (October 1966)
01 October 1962
Adopted by the Tenth International Conference of Labour Statisticians (October 1962)
01 May 1957
Adopted by the Ninth International Conference of Labour Statisticians (April-May 1957)
01 October 1926
Adopted by the Third International Conference of Labour Statisticians (October 1926)