How prevalent was polygamy among Jews in Biblical times?
I can only think of five Jews in Tanach who had multiple wives: Avraham, Yaakov, Elkanah, David, and Shlomo (although I probably missed a few). However, Avraham didn't marry Hagar until Sarah asked him to do so because of her infertility, and David and Shlomo were kings, so maybe they were unique in this regard.
Other well-known figures like Yitzchak, Yosef, Amram, Moshe, and so on have only one wife mentioned.
So was polygamy the exception or the rule in Biblical times? Did many or most Jewish men have multiple wives, or was this a rare, though permitted, occurance?