Data entry notes:
"the 1978 MARPOL Protocol allowed States to become Party to the Convention by first implementing Annex I (oil), as it was decided that Annex II (chemicals) would not become binding until three years after the Protocol entered into force. This gave States time to overcome technical problems in Annex II, which for some had been a major obstacle in ratifying the Convention" http://www.imo.org/en/KnowledgeCentre/ReferencesAndArchives/HistoryofMARPOL/Documents/MARPOL%2073-78%20Brief%20History%20-%20List%20of%20amendments%20and%20how%20to%20find%20them.htm The IEADB treats the Annexes to the MARPOL 73/78 Convention as separate "Protocols" for the purpose of assigning them an Agreement Type (level 2). All these annexes (both mandatory Annexes I and II and Optional Annexes III, IV, and V are BINDING, required explicit ratification, and entered into force separately and on different dates. See http://www.imo.org/en/About/Conventions/StatusOfConventions/Documents/Status%20-%202017.docx.pdf