Fig. 2. A. Changes in the standing volume of timber summed over the five northernmost counties in Sweden. Data from 1870 from Linder and Ístlund (1992), other data from the Swedish National Forest Inventory (SOU 2001:101). The data before 1990 are averages, while the data after 1990 are moving 5-year averages.
B. Estimated harvesting efficiency, measured as cubic-meters of wood produced by one man in one day. Data from Holmberg (2005)