There are about 50. The United States is a key one. Most of western Europe, the European Union, all EU countries except Romania, Bulgaria, and the Czech Republic, and also Australia, New Zealand, and Japan....
Evidence of meeting #59 for Citizenship and Immigration in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was eta.
A video is available from Parliament.