Percentage by year (approximately 4% of which are Izhevsk)
1949... 25, 1%
1950... 109, 5%
1951... 74, 3%
1952... 243, 11%
1953... 465, 20%
1954... 841, 37%
1955... 137, 6%
1955/56 (no date)... 402, 18%
Total... 2296 entries
Now for the most interesting calculation... SKS production total (so far) based on maximum serial number for each unique Cyrillic range (by year, prefix and suffix):
2,238,238
This production total will grow as the database grows. However, there are only a few more prefix/suffix combinations (by year) left, and I am now of the strong opinion that this number with ultimately level-out at approximately 2.5M units.
Take it for what it's worth, but super senior member "sksguide" is writing a book on the history of the SKS and has quoted a total production figure of 2,685,900 units, Tula and Izhevsk arsenals combined. He has not yet been able to separate the two factory totals.
"sksguide" is not a member of this forum (I don't think), so here is where I found the information:
http://forums.gunboards.com/showthread.php?103969-Izhevsk-SKS
This is what he said:
"Some folks on another board have questioned the production figures listed above. These production figures come from a russian language book written by s.v. monetchikov entitled and roughly translated as a history of the russian automatics. the other forum post calls me an expert. i don't call myself that. somehat knowledgable and still learning is more like it."
I am now confident that the 2.7M quoted by Monetchikov will be very close to my future production calculations! I am going to attempt to acquire a copy of the book and contact the author. I know people that can speak Russian, so I can ascertain his contacts and resources.
If all of the above is true, and I believe my methods/calculations are sound and forecasted to grow very close to Monetchikov's estimates, then the overall numbers of Russian SKS's are much less than what many believe at ~2.5 to 2.7M. Yes, the Chinese made many more, but from my perspective, they are as different as a Porche and a Chevy.
These are exciting times for Russian SKS collectors! And, while production numbers are fairly high, they are not "through the roof".