With few natural resources, poor soil, and overpopulation, the islands are one of the world's poorest nations. Some 80% of the people are involved in agriculture. Vanilla, ylang-ylang (used in perfumes), cloves, and copra are the major exports; coconuts, bananas, and cassava are also grown. Fishing, tourism, and perfume distillation are the main industries, and remittances from Comorans working abroad are an important source of revenue. Rice and other foodstuffs, consumer goods, petroleum products, and transportation equipment are imported. The country is heavily dependent on France for trade and foreign aid.