<Tr> <Td> 1984 Summer Olympics </Td> <Td> Los Angeles, California </Td> <Td> 28 July--12 August </Td> <Td> 140 </Td> <Td> 6,829 </Td> <Td> 221 </Td> </Tr> <Tr> <Td> 1996 Summer Olympics </Td> <Td> Atlanta, Georgia </Td> <Td> 19 July--4 August </Td> <Td> 197 </Td> <Td> 10,318 </Td> <Td> 271 </Td> </Tr> <Tr> <Td> 2002 Winter Olympics </Td> <Td> Salt Lake City, Utah </Td> <Td> 8--24 February </Td> <Td> 77 </Td> <Td> 2,399 </Td> <Td> 78 </Td> </Tr> <Tr> <Td> 2028 Summer Olympics </Td> <Td> Los Angeles, California </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> TBA </Td> </Tr>

When was the last time the us hosted the olympics