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自１９９９年３月以来，国际油价持续上扬。并于今年３月７日创造了３４．４３美元／桶的高峰。３月底欧佩克的增产曾让消费者松了一口气。然而，五六月份油价再次出现涨势。ＷＴＩ由４月底的２５美元／桶一直升到３０美元／桶以上。６月２１日欧佩克在做出再次增产的决定以后?
Since March 1999, international oil prices have continued to rise. And on March 7 this year created a 34.43 US dollars / barrel peak. The increase in OPEC at the end of March has given consumers a relief. However, oil prices rose again in May and June. WTI by the end of April 25 US dollars / barrel has risen to 30 US dollars / barrel above. June 21 OPEC after making the decision to increase production again?