Change in Forest Growing Stock, 1990-2015 (IMAGE) Terry Collins Assoc Caption From 1990 to 2015, forest growing stock rose annually by 1.31% in high income countries and by 0.5% in higher middle income countries. By contrast, forest growing stock fell by an annual average 0.29% in 27 lower middle income countries and by 0.72% in 22 low income countries. Credit University of Helsinki Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.