OPEC delivers three quarters of record oil cut in May - survey

LONDON (Reuters) - OPEC oil output hit the lowest in two decades in May as Saudi Arabia and other members started to deliver a record supply cut, a Reuters survey found, although Nigeria and Iraq are laggards in making their share of the reduction.On average, the 13-member Organization of the Petroleum Exporting Countries pumped 24.77 million barrels per day (bpd) this month, the survey found, down 5.91 million bpd from April's revised figure.OPEC and its allies last month agreed to an output..