Instruct: what is the highest u.s. rank when the foreign total s ton is more than 703,638, the year is earlier than 2005, the foreign imports s ton is 284,347 and the foreign exports s ton is smaller than 478,317?
Output: SELECT MAX U.S. Rank FROM table WHERE Foreign Total s Ton > 703,638 AND Year < 2005 AND Foreign Imports s Ton = 284,347 AND Foreign Exports s Ton < 478,317