<Tr> <Td_colspan="4"> Sinking of merchant shipping, during World War II . </Td> </Tr> <Tr> <Td> </Td> <Td> Submarines (number) </Td> <Td_colspan="1"> Ships sunk (number) </Td> <Td_colspan="1"> Tonnage sunk (tons) </Td> </Tr> <Tr> <Td> Germany </Td> <Td> 1,000 </Td> <Td> 2,000 </Td> <Td> 14.5 million </Td> </Tr> <Tr> <Td> United States </Td> <Td> </Td> <Td> 1,079 </Td> <Td> 4.65 million </Td> </Tr>

How many aircraft carriers did japan have at the end of ww2