[Related to the Economics in Practice on p. 383] The Economics in Practice article states that trade between developed nations fell in the last quarter of 2008, with the value of exports and imports of goods and services falling 18.5 percent and 18.6 percent, respectively, from the previous quarter. Search the Internet for export and import data since 2008 for developed nations. By how much have the values of these exports and imports increased or decreased since 2008? Explain if the changes in the values reflect the trade feedback effect.