This is the case in Poland, where sanitary thinning has included both damaged trees and deadwood. Nevertheless, except in 2007,13 deadwood removal from sanitary thinning as a share of merchantable timber has been halved since 2000 and was down to 15% in 2012. Selection-cutting (as opposed to clear-cutting) is often thought to be more beneficial for biodiversity, though there is still a lack of knowledge about how forestry without clear-cuts affects biodiversity.