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Adopted by the General Conference at its 3rd session and amended at its 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, 15th, 16th, 17th, 18th, 19th, 20th, 21st, 23rd, 24th, 25th, 26th, 27th, 28th, 29th, 30th, 31st, 32nd, 37th, 39th, 40th and 42nd sessions.