Answer:
16.9%
Explanation:
According, to statistics only 2% of the global coffee production is shade-grown. The US consumes 18% (of 17.5 billion pounds) of coffee produced annually.
Now assuming US coffee drinkers consumed only shade-grown coffee which is only 2% produced, then we subtract the annual consumption (18%) from 2%. Which implies:
18% - 2% = 16.9%