For the US you can look at http://usabda.org/dancesport_competitors/rules-policies-bylaws/dancesport_rulebook/index.cfm Look for 4.5.2.1 for details of how proficiency points are awarded.

Note that in USABDA competitions there is no *minimum* number of proficiency points required to advance to the next level. You can start wherever you want, and you can move up whenever you feel like it. The points are there to force people who have achieved a certain amount of success at a lower level into the higher levels. So, if you have three proficiency points in a level you can't do that level any more and have to move up, but you don't have to wait until you have three points to move up.