I've kept a mood chart for the last two years that shows I spend relatively long periods of time being hypomanic; however the number of full-blown manic and depressive episodes are pretty equal. Depression tends to last longer as compared to manic episodes, probably because my pdoc is a lot more aggressive in treating my mania (I do tend to be pretty destructive in that state).

But the truth is, I just have a lot of mood episodes, and it's only been in recent months that the euthymic periods have started lasting long enough to make a difference in how I feel overall.