Wood provides more than half of national primary energy supplies in 29 countries, of which 22 are in sub-Saharan Africa. Overall, forests supply about 40 percent of global renewable energy in the form of woodfuel - as much as solar, hydroelectric and wind power combined. The wood processing sector has made good progress in increasing the efficiency of wood utilization. Although sawnwood and wood panel production grew by 8.2 percent per year between 2000 and 2015, this required only a 1.9 percent growth in input from industrial roundwood. Meanwhile, per capita consumption of wood-based panels (which are more efficient in terms of wood utilization) grew by 80 percent, while sawnwood consumption remained static. Meanwhile, the share of wood products that FSC and PEFC certify as coming from sustainably-managed forests has also increased, now representing 40 percent of global industrial roundwood production.