U.S. volume per capita in 1999 was 739 pieces while Italy's was 115 pieces per capita.
U.S. volume per capita in 1999 was much higher than Italy's. 
mnli hypothesis: U.S. volume per capita in 1999 was much higher than Italy's.  premise: U.S. volume per capita in 1999 was 739 pieces while Italy's was 115 pieces per capita.