They call it "Inventory."

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Finland has been carefully husbanding their forests since the 1920s, and their  consistent and wise efforts have paid off: 

"Compared to the early 1900s, the amount of growing stock in Finland has increased by over 60 percent."

 

Consider also that they have way less to work with!
They have ~30% hardwood, and 70% conifer. We have just about the opposite here in the Upper Peninsula, 70% hardwoods/30% conifers. 

Pine trees aren't as energy-dense as hardwoods. 

 

Have a look at the graph below and click it for more great Finnish forestry facts: