More than half, based on past experience watching the requested fandoms list. The question is how many of the characters I'm offering will be requested. I usually get matched with someone requesting "Any" characters, since I usually only offer female characters.
I think I just spent a couple hours on it and I'd already gone through and made a first list of all the fandoms I recognized and might feel like writing someday, from which I pulled the actual fandoms I offered to write.
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Yuletide = Serious Business, obviously.