It depends on the round, but I'd say overall the US sends the most number of people in absolute terms, but they are not the majority by any stretch. There is a

It depends on the round, but I'd say overall the US sends the most number of people in absolute terms, but they are not the majority by any stretch. There is a good number of Canadians, Europeans and Indians too. In my round there was a strong contingent from Brazil. Also there are a fair number of 'internationals' - people who have spent years living outside of their home country. Its a broad mix of people with all sorts of backgrounds.