<Tr> <Td> 1862 </Td> <Td> 59 tons </Td> </Tr> <Tr> <Td> 1866 </Td> <Td> 81 tons </Td> </Tr> <Tr> <Td> 1875 </Td> <Td> 50 tons </Td> </Tr> <Tr> <Td> 1878 </Td> <Td> 78 tons </Td> </Tr>

When did the us give up the gold standard