The table below gives the popultaion and water footprints of China, India, and the United States between 1996-2005.

china population (in millions) 1,400 Total water footprint (in 10^9 cubic meters per year) 1,368

India 1,100 1,145 U.S. 350 821

Calculatethe water footprintper capitafor the United States. Round your answer to the nearest whole number, and be sure to include the correct units (in words) in your answer.