From a VOA broadcast- The Making of America:
"No one knows for sure how many Americans remained loyal to Great Britain. The Massachusetts political leader, John Adams, thought about thirty-three percent of the colonists supported independence, thirty-three percent supported Britain, and thirty-three percent supported neither side. Most history experts today think that about twenty per cent of the colonists supported Britain. They say the others were neutral or supported whichever side seemed to be winning."
Not that it has squat to do with the OP, so I think I'll quit my participation in this particular derail, and maybe chime in if it gets back on topic. ( Or if we find out it was the French.
)