In the current rate of population decrease in Japan because of the country, people in the country has chosen not to have a family, have a less than before. Make less demand and less wood.
The current rate of population decline in Japan. Because people in families choose not to. Thus, creating a home less than before. Demand for timber production makes less and less.
The current birth rate in Japan decreased. Because the country choose to have no family. The house less than before. Make less and less demand for wood production