The new rules will cap domestic banks' and non-bank financial institutions'
currency forwards and derivatives at 50 percent of their equity capital. The
cap for foreign bank branches was set at 250 percent of equity to account
for their lower capital, which on average is just 1/30 of that held by
domestic banks.

http://www.reuters.com/article/idUSTRE65C0HZ20100613

Best Regards

Tom.