<Tr> <Th> UNSC seat </Th> <Td> Non-permanent </Td> </Tr> <Tr> <Th> Ambassador </Th> <Td> Christoph Heusgen </Td> </Tr> <Table> German Democratic Republic <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> United Nations membership </Th> </Tr> <Tr> <Th> Membership </Th> <Td> Former full member </Td> </Tr> <Tr> <Th> Dates </Th> <Td> 1973 (1973)--1990 (1990) </Td> </Tr> <Tr> <Th> UNSC seat </Th> <Td> Non-permanent (elected once) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> United Nations membership </Th> </Tr>

When did germany become a permanent member of the un security council