NAIROBI — Aliko Dangote says the number of shares offered in the Dangote Petroleum Refinery IPO may be increased because of high demand. Speaking in Nairobi, he described investor interest as enormous. The offer of 4.1 billion shares at N525 each is worth about N2.15 trillion. Bamboo, an investment platform, said new account openings rose 350 per cent in the week before the offer. Dangote Group Vice President Devakumar Edwin said about half of the refinery's output is exported.