<Tr> <Th> Website </Th> <Td> www.mintnigeria.com </Td> </Tr> <Tr> <Th> Mint </Th> <Td> Nigerian Security Printing and Minting Company Limited </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.mintnigeria.com </Td> </Tr> <Tr> <Th_colspan="2"> Valuation </Th> </Tr>

Naira and kobo was introduced in nigeria in what year