the external part of a nation's water footprint varies strongly from country to country. some african nations, such as sudan, mali, nigeria, ethiopia, malawi and chad have hardly any external water footprint, simply because they have little import. some european countries on the other hand—e.g. italy, germany, the uk and the netherlands—have external water footprints that constitute 50–80% of their total water footprint. the agricultural products that on average contribute most to the external water footprints of nations are: bovine meat, soybean, wheat, cocoa, rice, cotton and maize.