SEOUL, March 19 (Yonhap) -- North Korea saw its forests shrink by nearly 31 percent in the past 20 years, a report by an international organization said Tuesday.

The size of forestlands in North Korea is down 30.9 percent as of 2010, compared to 1990, the 2013 Human Development Report by the United Nations Development Program said. The report ranked about 40 developing countries in terms of human development. It disclosed the North Korean data without including the country in its ranking.