Coffee is grown on a large scale on both estates and by smallholders that form co-operatives and involves over 400,000 farmers. Coffee has been grown in the country since the colonial times and is a major export crop, earning over 17 percent of the country's foreign exchange. Tanzania mainly grows the arabica type; however, small farms in the Kagera Region grow Robusta coffee. Tanzanian coffee is globally more commonly known as Kilimanjaro Coffee.