CARACAS, June 27 (Xinhua) - Venezuelan oil for export closed at123.93 U.S. dollars per barrel Friday, 1.09 dollars lower than the historic high of last week.

The Energy and Petroleum Ministry (MEP) weekly report said the week from June 23 to June 27 was characterized by new historic highs.

The report cited problems in production in the Northern Sea and Nigeria, and the growing tension between Israel and Iran as the main causes pushing up average oil prices in world markets.

The U.S. dollar's weakness in relation to the euro, coupled with the U.S. Federal Reserve's decision to keep interest rates unchanged, added to the price spiral, the report said.

The average price per barrel in Venezuela during the last week surpassed the average so far this year of 99.38 U.S. dollars by 21.55 dollars.