Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Blue and red bars respectively represent period 1990–2000 and 2000–2010. In this figure, F, G, D, P, W, B are short for forest, grass, dry farmland, paddy field, water and building lot, respectively.
