It would change from year to year, as the tax situation and parameters change for any given credit union or co-op. Among large credit unions, it's fair to say that most do not hit their limit in any given year. The credit unions that would be more likely to hit their limit may be the small credit unions that are not growing, but they would have access to the small business deduction, so the additional deduction is not relevant to them.
On May 9th, 2013. See this statement in context.