<Tr> <Td_colspan="2"> An Amur leopard at Colchester Zoo, England . </Td> </Tr> <Tr> <Th_colspan="2"> Conservation status </Th> </Tr> <Tr> <Td_colspan="2"> Critically Endangered (IUCN 3.1) </Td> </Tr> <Tr> <Th_colspan="2"> Scientific classification </Th> </Tr>

When was the amur leopard listed as endangered