One of the most important unknowns is how many of the selectees will return their forms, how many will be denied and how many will get their visas. So the selectee to visa issued ratio (which varies by country and region) is important.
USCIS PUblish data about that at the bottom of this page -
http://travel.state.gov/visa/immigrants/types/types_1322.html
I've looked at the three years 2011, 2012 and 2013 to see if history could tell us anything.
For 2013, we have the published selectee counts but we do not have the official visas issued numbers. We do have the CEAC data but it is missing some cases that never got in to CEAC AND it is missing the AOS cases. However, what
is there is very accurate and verifiable.
2012 was a horrendous year for the lottery. The draw was made, people were notified and then they realised it was an invalid draw, so they threw away the results and redrew the winners around July 2011. That resulted in a very low response rate (I believe because many people didn't get to hear about the redraw and didn't recheck their numbers). Less than 35k visas were issued - really this year should NOT be used for analysis.
2011 is the most recent "reliable" year. From that year we see a standard number of selectees (with selectee ratios somewhat similar to this year) and just over 51k visas were issued.
I have gathered the selectees per region and the results for visas issued. I have shown 2011 data but also for comparison the 2012 data and then 2013 thown a couple of ways. Neither the 2012 nor the 2013 examples are worth relying on, in my opinion - but interesting to have them. The last column that shows the demand, shows how "oversubscribed" the lottery is this year. The max number for the global total cannot be more than 55,000 so unless 2012 happens again (which is ridiculous) there will be a shortfall. I will add my predictions for regional quotas later...
The data is shown here:-
https://docs.google.com/spreadsheet...ZnlmcU1id1Vsd3F6Qm9SQThSYUE&usp=sharing#gid=0