Probably, Oleg Rastrenin is the best source for everything Il-2/Il-10 related. He wrote many articles and several good books, the earliest ones with his (late) co-author Vladimir Perov.Il-2 statistics can be tricky as large share of aircraft produced was held in reserve, probably up to fifty percent in 1944-1945. I should have something among the Russian sources, will check them soon.
From one of his latest books:
Total combat Il-2 losses 1941-1945: 11,448
1941: 503
1942: 1,676
1943: 3,649
1944: 4,748
1945: 1,800 (01.06.1945)
Average flight/loss ratio: 53.5. In comparison: all fighters 104.5, all bombers 80.
Share of Il-2 in VVS aircraft of all types:
1941 0.2%, from the end 1942 to 1945 29%-32%
Total inventory on 10th May 1945 (front line, not including reserve regiments):
VVS Army - 3,075 of Il-2(incl. trainers), 214 Il-2KR(spotters) and 146 Il-10.
VVS Navy - 197 Il-2 and 12 Il-10.
VVS Army has received in 1941-1945: 8,067 Il-2 one-seaters, 23,882 Il-2 two-seaters, 1,134 Il-10.
Source:
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