The Mexican peso has hit its lowest level ever against the dollar Wednesday, trading an average of 16.52 on the interbank market, the Bank of Mexico said. The decline, the latest in a string of new lows this year, is due to pressure from falling oil prices and an anticipated interest rate hike in the U.S., MetAnalisis consultant Gerardo Copca told The Associated Press. He said it also was influenced by the poor performance of China's economy, whi…