25 years and closing in on 200 whitetails, I would very roughly estimate the following:

Prone - 1%
Sitting in a box stand propped on window - 5%
Sitting in a treestand free handed - 10%
Sitting in a treestand propped - 30%
Sitting on ground propped on shooting sticks or small tree or knees - 30%
Standing freehanded - 5%
Standing propped on tree, fence, atv, etc. - 4%
Archery - 15%