<Table> Federal Government of Nigeria <Tr> <Td_colspan="2"> Coat of arms of Nigeria </Td> </Tr> <Tr> <Th> Formation </Th> <Td> 1963; 55 years ago (1963) </Td> </Tr> <Tr> <Th> Founding document </Th> <Td> Constitution of Nigeria </Td> </Tr> <Tr> <Th> Jurisdiction </Th> <Td> Nigeria </Td> </Tr> <Tr> <Th_colspan="2"> Legislative branch </Th> </Tr> <Tr> <Th> Legislature </Th> <Td> National Assembly </Td> </Tr> <Tr> <Th> Meeting place </Th> <Td> National Assembly Complex </Td> </Tr> <Tr> <Th_colspan="2"> Executive branch </Th> </Tr> <Tr> <Th> Leader </Th> <Td> President of Nigeria </Td> </Tr> <Tr> <Th> Headquarters </Th> <Td> Aso Rock Presidential Villa </Td> </Tr> <Tr> <Th> Main organ </Th> <Td> Cabinet </Td> </Tr> <Tr> <Th_colspan="2"> Judicial branch </Th> </Tr> <Tr> <Th> Court </Th> <Td> Supreme Court </Td> </Tr> <Tr> <Th> Seat </Th> <Td> Abuja, FCT </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Coat of arms of Nigeria </Td> </Tr>

When did nigeria adopt the presidential system of government