Using data from the types of fighter planes a specific fighter group flew and USAAF aerial claim victory I was able to get the number of aerial victories by the USAAF by plane flown. Below is a time series showing this for separated by European Theater of Operations (ETO) and Mediterranean Theater of Operations (MTO).
One can see that between the heavy fighting months of early 1944 (especially after Feb) the P-51 had a majority of claims compared to P-47's and P-38s in the ETO.
