I find that for me it depends on the size of my gut at the time. For example:

If its around 39" maybe 10% on the drops. I dont even get on the hooks when I am like this.

If its about 32" I would guess 75% on the drops. 5% on the hooks when there is headwind or really short and steep inclines/declines. I just feel more comfortable and "supported" on the drops, when I am thinner.

I don't ride the hoods that I can remember. I am sure I ride them sometimes, especially if I am anticipating braking, but I just cant remember the last time I did it. If I do it has to be for a very short amount of time. I don't really know right now.