This one seems the largest dist for any cef this yr. It looks to be roughly 12% on the mp & is mostly LTG in case there are those who can use an LTG to offset losses.
http://funds.nomura-asset.com/wp-content/uploads/JOF-Press-Release-Dec-2017-Distribution-FINAL.pdf Most cefs anymore prefer to distribute more uniformly around the yr rather then all @ once @ yr end. The mp did not jump that much after the announcement for whatever that may mean. I would think it might have a little juice left on it but that's just a guess.