Puerto Rico lacks arable flat lands and natural resources. The only truly abundant resources on the island are clay, sand, and limestone. Despite these drawbacks, Puerto Rico depended heavily on agriculture until the mid-1950s, when industry and services showed rapid growth and development. Sugar, exported in large quantities to the United States, was the primary cash crop . Other major crops were coffee and tobacco. The production of these 3 crops has declined considerably since the 1950s, although sugar production is still important for the production of rum and molasses. Despite expansion in dairy products, livestock, poultry and eggs, and exotic citrus fruits, the importance of the agricultural sector has diminished. In addition, tropical and hard woods supply a very small furniture industry on the island. From an environmentalist standpoint, deforestation rates are almost nonexistent. Game fishing exists in the coastal regions, but most of the island's fish come from the U.S. fishing industry in waters closer to Africa. These U.S. fleets bring their catch to Puerto Rico to be processed and exported.