Economy

The Lao economy is heavily dependent on investment and trade with its neighbours, Thailand, Vietnam and especially North China.
http://en.wikipedia.org/wiki/Laos#Economy
a) How much of the land is arable land and how much is permanent crop land?
b) What is the dominate crop of Laos? What percent of faming house hold are self sufficient with this crop?
c)What mineral resources have to be imported into Laos?