Fourth-quarter earnings from recently merged BHP Billiton, up 9 1/2p at 413p, jumped 75%, but the mining giant posted a modest 2.9% increase in full-year net profit of US$1.866bn (£1.187bn). London and Sydney-listed BHP blamed 'weak' and 'anaemic' global demand for the flat result, which was struck on a 15% increase in turnover to $117.5bn.