When was the decision for the Hajj quota allocation formula made?

When was the decision for the Hajj quota allocation formula made?

حج کوٹہ مختص کرنے کے فارمولے کا فیصلہ کب ہوا؟
Explanation

The decision for allocating one Haji per one thousand Muslims

It was made at the Foreign Ministers' Meeting of the Organization of Islamic Conference in 1987.