Nymex crude has since climbed nearly 18% from its first-quarter average, but the Amex Oil Index, tracking the 13 biggest oil companies, has risen just 5% in April.

• 虽然纽约商交所原油期货价格目前已较第一季度平均水平上涨了近18%25，但追踪13家最大石油公司股价走势的美国证交所石油指数4月份仅上涨了5%25。