<Tr> <Td> UGM - 133A Trident II D - 5 W76 - 1 / Mk4A </Td> <Td> N / A </Td> </Tr> <Tr> <Td> UGM - 133A Trident II D - 5 W88 / Mk5 </Td> <Td> N / A </Td> </Tr> <Tr> <Th> SLBM (total) </Th> <Th> 230 </Th> <Th> 920 </Th> </Tr> <Tr> <Td> B - 2 </Td> <Td> 12 </Td> <Td> N / A </Td> </Tr>

When did the us stop making nuclear weapons