Are you sure it's based on applicants?
And the UK wasn't even allowed to participate anymore this year, because there are already enough brits in the US according to Immigration.
Here's how it was explained to me, could be wrong, but that's what I've been told.
It's not so much about how many participants of each country, but really about establishing "diversity" of nationalities in the US, hence some countries with supposedly low total numbers of this nationality in the US already (vs the total % of their home population) get granted more DV's.
So those newly created countries in the East, like Kosovo, Montenegro, Moldova, they are not that much bigger then Belgium but get more DV's assigned coz there are virtually no nationals of these countries in the US. Now when these countries where still part of Russia, Yugoslavia, they had a much smaller chance or percentage DV's assigned to their larger country.
Hence, I'm rooting for Belgium to split in two and we have the Country of Flanders and Wallonia, suddenly you'll see, rather then Belgium 82 DV's, Flanders will be assigned 2,000-odd DV's and so will Wallonia.
Of course Belgium will never be split in two, Flemish & Walloons will keep arguing and my changes (I'm Belgian

) of winning the DV will continue to be slim.
If I've got this wrong, please correct me, this is how some explained this to me.