So these charts are from the Osprey book "Aircraft of the Aces 2" - "
Bf 109 Aces of North Africa and the Mediterranean", pages 81-82
He lists Luftwaffe
Bf 109 fighter strength* at various key points in the MTO battles, showing both total strength and serviceable.
1941 (various dates) starts at 14/11 and ends at 154/98
1942 Aug 20- shows 194 on strength and 125 serviceable
1943 Oct - Tunisia- shows 235 on strength and 137 serviceable (excluding Eastern Med and the Balkans)
1943 Oct - Sicily- shows 324 on strength and 182 serviceable
1944 March - Anzio - shows 93 Serviceable
1944 May - shows 54 / 37
Again, this is only Luftwaffe Bf 109 strength, it does not show Bf 110, Do 17, or Fw 190 aircraft. So the strength fluctuates a lot, and peaks in late 1943, but remains high from late 1941 through October of 1943, but appears to plummet by Spring of 1944.
On the second page he breaks down Bf 109 strength by area
in Aug 1942 in North Africa to 112 / 65 and Sicily to 71 / 54, plus 11/6 on Crete
in Oct 1943 in Tunisia to 196 / 114 plus 39/23 on Crete
So you can still make the claim that close to half of these fighters are in Sicily in August and therefore don't count (I would not agree with this but that is another debate), though some of those moved to North Africa during or right after El Alamein and then Torch.
It's worth pointing out, in addition to the above Bf 109 units,
several Fw 190 units were also fighting in North Africa and the Med from 1942. According to
this site the following units were deployed to North Africa starting on 16 November 1942: III./Z.G. 2, III./S.K.G. 10, II./J.G. 2, the
Stab and II./Sch.G. 2,
That site lists 6 Fw 190 pilots with 88 victories between them from II./J.G.2 alone (70 from the top two experten)

Here is another interesting table from "
Strategy for defeat, the Luftwaffe 1933-1945" page 149, shows that Luftwaffe
fighter losses by Theater. The MTO had the highest losses through May of 1943, reaching a peak in early April at 247 (overall aircraft losses are roughly double the fighter losses). Losses in the Western or Channel front did not catch up until May of 1943, then peaking in July. MTO losses remained higher than Russian Front losses for most of the year.
I think that shows pretty clearly that the MTO was a major comittment and source of losses for the Luftwaffe as well as the Regia Aeronautica, and that the Luftwaffe was committing a substantial amount of it's best fighters to the area.
I hope this helps shed light on the discussion.
* does not include Fw 190 units - JG-2 or Regia Aeronautica Bf 109 units