Passage: OFID played a significant role in the establishment of IFAD, channeling US$861.1 million in contributions from OPEC member countries towards the agency’s initial capital and first replenishment. Since IFAD's creation, OPEC member states have maintained their firm support of the agency, contributing to additional replenishments of its resources. In addition, OFID itself has given a further US$20 million as a special contribution from its own resources.

Question: Who has stayed supportive of the agency?
OPEC member states