<Tr> <Td> Nagano </Td> <Td> Japan </Td> <Td> Asia </Td> <Td>--</Td> <Td> W018 XVIII </Td> <Td> 1998 </Td> <Td> 000000002017 - 02 - 07 - 0000 February 7 </Td> <Td> 000000002017 - 02 - 22 - 0000 February 22 </Td> </Tr> <Tr> <Td> Sydney </Td> <Td> Australia </Td> <Td> Oceania </Td> <Td> S027 XXVII </Td> <Td>--</Td> <Td> 2000 </Td> <Td> 000000002017 - 09 - 15 - 0000 September 15 </Td> <Td> 000000002017 - 10 - 01 - 0000 October 1 </Td> </Tr> <Tr> <Td> Salt Lake City </Td> <Td> United States </Td> <Td> North America </Td> <Td>--</Td> <Td> W019 XIX </Td> <Td> 2002 </Td> <Td> 000000002017 - 02 - 08 - 0000 February 8 </Td> <Td> 000000002017 - 02 - 24 - 0000 February 24 </Td> </Tr> <Tr> <Td> Athens </Td> <Td> Greece </Td> <Td> Europe </Td> <Td> S028 XXVIII </Td> <Td>--</Td> <Td> </Td> <Td> 000000002017 - 08 - 13 - 0000 August 13 </Td> <Td> 000000002017 - 08 - 29 - 0000 August 29 </Td> </Tr>

When was the last time usa hosted olympics