The 600 number is just for U.S. and Canada, and it is an overrated number, the actual number on U.S. and Canada might be lower. U.S. and Canada total < WorldWide total Generally, U.S. and Canada (starting in 2008) get 30% of the worldwide allocations. Using Russell's info, the number oscillates between 450-550 in U.S. and Canada. The 250 units in 2008 for U.S. and Canada is from an official source, and it was published in an interview.