Go to the Census Bureau's webpage on U.S. Trade Balances by Country at https://www.census.gov/foreign-trade/balance/index.html. What were U.S. imports from Mexico, Canada, Japan, and China in 2001? Next, go to https://www.census.gov/foreign-trade/statistics/historical/gands.txt to obtain total U.S. imports in 2001. Finally, compute the proportion of total U.S. imports in 2001 that came from Mexico, Canada, Japan, and China.