By Rhodri Morgan The cost of Easter eggs could increase again as bad harvests continue to dent global cocoa supplies, sending prices to a new all-time high. Cocoa futures traded on the New York exchange are up 50 per cent in the last 28 days as unseasonable weather conditions and crop disease in West Africa continue to ravage harvests. Shipments were down from Ivory Coast by almost a third between October and March compared to the same period the year prior. The shortage has sent cocoa prices north of $9,000 (£7,119) a ton, setting a new all-time high just one week before Easter. “It seems lik…