(5) The amendment shall enter into force for those Contracting Parties which have ratified, accepted
or approved it on the thirtieth day after receipt by the Depositary Government of notification of its ratification,
acceptance or approval by at least four fifths of the Contracting Parties. Thereafter the amendment shall enter
into force for any other Contracting Party on the thirtieth day after that Contracting Party has deposited its
instrument of ratification, acceptance or approval of the amendment