Data Sufficiency

17. From 1984 to 1987, the value of foreign goods consumed annually in the United States increased by what percent?
(1) In 1984 the value of foreign goods consumed constituted 19.8 percent of the total value of goods consumed in the United States that year.
(2) In 1987 the value of foreign goods consumed constituted 22.7 percent of the total value of goods consumed in the United States that year.


Hi,
The answer is E) but I was trapped and thought the answer was C).... Can anyone please explain?

The trap lies in the fact that the total value of goods consumed in the United States is different in both years. So you are told that 1984 foreign amt = 0.198x and 1987 foreign amt = 0.227y. You are told nothing about the relation between x and y.