<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2017) (Learn how and when to remove this template message) </Td> </Tr> <Table> Oando PLC <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Type </Th> <Td> Public </Td> </Tr> <Tr> <Th> Traded as </Th> <Td> NSE: OANDO JSE: OAO </Td> </Tr> <Tr> <Th> Industry </Th> <Td> Oil and Gas </Td> </Tr> <Tr> <Th> Founded </Th> <Td> 1956 (ESSO) </Td> </Tr> <Tr> <Th> Headquarters </Th> <Td> Victoria Island, Lagos, Nigeria . </Td> </Tr> <Tr> <Th> Area served </Th> <Td> West Africa </Td> </Tr> <Tr> <Th> Key people </Th> <Td> Adewale Tinubu (GCE) Omamofe Boyo (DGCE) </Td> </Tr> <Tr> <Th> Products </Th> <Td> Oil Petroleum Natural gas Petrochemical Fuel Lubricant </Td> </Tr> <Tr> <Th> Revenue </Th> <Td> ₦ 267.8 Billion (2017 - H1) </Td> </Tr> <Tr> <Th> Operating income </Th> <Td> ₦ 28.8 Billion (2017 - H1) </Td> </Tr> <Tr> <Th> Total equity </Th> <Td> ₦ 198.7 Billion (2017 - H1) </Td> </Tr> <Tr> <Th> Number of employees </Th> <Td> 1,000 </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.oandoplc.com </Td> </Tr> </Table> <Tr> <Th> Type </Th> <Td> Public </Td> </Tr>

When did oando commence business operations as a petroleum marketing company