But people say the area's largest export is its young.
Lumber was the largest export of the city at this time.
The nation's largest legitimate export, coffee, earned $1.5 billion in 1988.
In terms of weight, that paper is already the city's largest foreign export.
By the 1930s, coffee had become Brazil's largest export and accounted for 30% of the world's production.
Copra cake and oil are by far the nation's largest exports.
But she said 457,984 foreign students attended American colleges in 1996, making education the country's fifth largest export.
It is known for its large exports of bananas.
After petroleum, the second largest export is coffee, which generates about $10 million a year.
The major source of recent growth in Niger has been uranium, the nation's largest export.