James, I would guess that no one could answer that one accurately apart maybe Mark Knibbs who may have the BSA production records?
The .177 was made in smaller numbers across the Airsporter ranges - about 25% roughly?
It will probably depend upon how many of each were manufactured - I believe the stuzen models had a longer production run, so I would make an educated guess that the carbine models would be less - but I may well be wrong!
Perhaps someone knows better!
ASM