It's hard to say, but if I were to guess over the past year....

Depression: 30%
Hypomanic: 10%
Manic: 10%
Mixed: 35%
Stable: 15%

Varies in intensity though....sometimes it'll be a full-blown episode, other times the symptoms are causing me enough trouble to not be considered "stable" or well, but I'm somewhat managing. I get some psychotic symptoms during the mania or mixed states only about 1% of the time now (over the past year) now that I usually pick up on it early enough to tell the pdoc, then she adjusts the meds to nip it in the bud.