If we measure total hectares, then China is leading, followed by Canada, USA, Russia and India. Those countries are big, that’s why they manage to plant a lot. However this “planting” appeared to be a bad measure of how “forest loving” a country is because Brazil and Indonesia are significantly reducing their total forest area.
If we take the percentage of total land, then Sweden is leading, they planted 14,5% of their land area with trees. I even googled to see if this enormous number could be real, and seems it is, they even achieved Guinness world record in plating. However, this planting is made only to recover for what IKEA used because the total volume of forests increased only a bit in Sweden. It seems that Finland has quite a similar situation.
What: Planted forest and total forest area changes
When: 1992 to 2017
Where: Top 15 by each measure. Some countries are not included, because for 1992 they did not have existing data, e.g. Czech and Slovak republics were still Czechoslovakia. It might be possible that one such country could appear in the top 15 by %.