By 2020, Middle East will still be the main oil supplier. - Although non-conventional oil production by the US and Brazil will account for much of the growth over the next decade, OPEC and particularly Middle Eastern countries, are expected to remain the main source of growth in production from 2020, according to the most recent annual report, World Energy Outlook 2013, by the International Energy Agency (IEA). OPEC's share of global production is expected to fall from 43% to 41% between...