Recent amendments to MARPOL Annex VI – Regulations for the Prevention of Air Pollution from Ships require that from calendar year 2019, each ship of 5,000 gross tonnage and above collect the data specified in appendix IX of MARPOL Annex VI, for that and each subsequent calendar year or portion thereof, as appropriate.
Source: USCG
Link: 7/2/2018: MARPOL Annex VI fuel oil consumption reporting