<Tr> <Td> Triathlon </Td> <Td> Since 2000 </Td> </Tr> <Tr> <Td> Tug of war </Td> <Td> 1900--1920 </Td> </Tr> <Tr> <Td> Volleyball </Td> <Td> Since 1964 </Td> </Tr> <Tr> <Td> Water motorsports </Td> <Td> 1908 </Td> </Tr>

When was the last olympics hosted in the united states