By June 2016, when British voters chose to leave the EU, the CFP limited British fishermen to 36 per cent of the total catch from their home country's waters, which amounted to a quarter of the total EU catch. Cod stocks had rebounded to sustainability and the British fleet's net profit margin had become the highest in the EU at 35 per cent, and second only to Spain's in terms of capacity by gross tonnage. British fishermen still strongly supported Brexit due to the restrictions of the CFP, which many identified as the reason for the industry's decline; the overall size, capacity and power of the British fishing fleet had declined by about 30 per cent since 1996. A poll taken two weeks before the referendum found 92 per cent of fishermen planned to vote Leave, with many of those who did believing that departure from the EU would benefit their industry.