luftwaffe losses by theatre per month

[FarKenal]

Hi all, after alot of searching I was still unable to find totals on how many luftwaffe fighter aircraft were shot down in each theatre per year (preferably month), and was hoping if somebody could point me in the right direction.

Basically a mate and I had been discussing the significance of american airpower in helping to destroy the luftwaffe, and how if there was no american aircraft how the transfer of luftwaffe fighter planes to the eastern front would of affected outcomes on the eastern front, though was defeat already certain etc.

any help with this elusive matter will be greatly appreciated, thanks