I curious, how many non-US Olympic boxers have made any impact in professional boxing?

Seems like we watch many US boxers of the past that have had a huge impact. examples: Oscar De La Hoya, Roy Jones Jr. but aside from England and a few Cubans, I don't recall any other Olympic boxers even turning to Professional Boxing. One would think that the kind of Paydays US Gold Medal winners have had that it would draw more elite competition from other countries into the Professional Ranks.

Perhaps the life is so bad for most in other countries that Olympic training and competition is their career choice?