I don't have any figures on that gap specifically. We do know that, during the recession, immigrants were more likely to lose their jobs and be laid off than non-immigrants. But one of the big reasons they were more likely to be laid off was that they had little seniority, as is the case for young people. Many companies adopt the last on, first off approach. So that's one factor. Although it isn't the only one, it does help to explain why they were hit harder than other workers.
On March 6th, 2014. See this statement in context.