*US DEC. PRODUCER PRICES RISE 0.5% M/M; EST. +0.2% *US DEC. PRODUCER PRICES RISE 3% Y/Y; EST. +2.7% *US DEC. CORE PPI RISES 0.7% M/M; EST. +0.2% *US DEC. CORE PPI RISES 3.3% Y/Y; EST. +2.9%