<Tr> <Td> July 9, 1956 </Td> <Td> 275 </Td> <Td> − 6 </Td> </Tr> <Tr> <Td> February 26, 1958 </Td> <Td> 280 </Td> <Td> + 5 </Td> </Tr> <Tr> <Td> September 2, 1958 </Td> <Td> 288 </Td> <Td> + 8 </Td> </Tr> <Tr> <Td> June 30, 1959 </Td> <Td> 295 </Td> <Td> + 7 </Td> </Tr>

Who owns the most debt in the world