AFP tallies the walkouts.
Delegations from Argentina, Australia, Britain, Costa Rica, Denmark, France, Germany, Hungary, Italy, New Zealand and the United States left the room as Ahmadinejad began to rail against Israel, a European source said.
Israel had already called for a boycott of the speech, and was not present when the Iranian leader began his address. Canada had already said it would heed the boycott call.
Judging from photos such as this, it might’ve been easier to figure out who didn’t leave.