<Table> <Tr> <Th> World ranking </Th> <Th> Name </Th> <Th> Citizenship </Th> <Th> Net worth (USD) </Th> <Th> Sources of wealth </Th> </Tr> <Tr> <Td> 67 </Td> <Td> Aliko Dangote </Td> <Td> Nigeria </Td> <Td> 17.7 Billion </Td> <Td> Sugar, flour, cement </Td> </Tr> <Tr> <Td> 393 </Td> <Td> Mike Adenuga </Td> <Td> Nigeria </Td> <Td> 4.2 Billion </Td> <Td> Telecommunication, petroleum </Td> </Tr> <Tr> <Td> 949 </Td> <Td> Folorunsho Alakija </Td> <Td> Nigeria </Td> <Td> 2.0 Billion </Td> <Td> Fashion industry, oil </Td> </Tr> <Tr> <Td> 1741 </Td> <Td> Femi Otedola </Td> <Td> Nigeria </Td> <Td> 1.0 Billion </Td> <Td> Petroleum </Td> </Tr> <Tr> <Td> 1741 </Td> <Td> Abdul Samad Rabiu </Td> <Td> Nigeria </Td> <Td> 1.0 Billion </Td> <Td> Foods </Td> <Td> 1741 </Td> <Td> Okosun Esther Ese - osa </Td> <Td> Nigeria </Td> <Td> 1.0 Billion </Td> <Td> Music </Td> </Tr> </Table> <Tr> <Th> World ranking </Th> <Th> Name </Th> <Th> Citizenship </Th> <Th> Net worth (USD) </Th> <Th> Sources of wealth </Th> </Tr> <Tr> <Td> 67 </Td> <Td> Aliko Dangote </Td> <Td> Nigeria </Td> <Td> 17.7 Billion </Td> <Td> Sugar, flour, cement </Td> </Tr> <Tr> <Td> 393 </Td> <Td> Mike Adenuga </Td> <Td> Nigeria </Td> <Td> 4.2 Billion </Td> <Td> Telecommunication, petroleum </Td> </Tr>

How many billionaires do we have in nigeria