Agriculture employs 27% of Uzbekistan's labour force and contributes 17.4% of its GDP (2012 data). Cultivable land is 4.4 million hectares, or about 10% of Uzbekistan's total area. While official unemployment is very low, underemployment – especially in rural areas – is estimated to be at least 20%. Cotton production in Uzbekistan is important to the national economy of the country. Uzbek cotton is even used to make banknotes in South Korea. The country has a considerable production of carrots as well. The use of child labour in Uzbekistan has led several companies, including Tesco, C&A, Marks & Spencer, Gap, and H&M, to boycott Uzbek cotton.