Uzbekistan is the world's sixth largest producer of cotton, and the fifth largest exporter. For decades, Uzbekistan has used the forced labor of its schoolchildren starting in the early primary grades, college and university students, and civil servants, to harvest that cotton by hand. The human rights concerns surrounding Uzbek cotton production has lead to a 'call for a boycott' of Uzbek cotton from Uzbek and international activists. Around 70 per cent of Uzbekistan cotton is sold to Bangladesh and China, where it is turned into fabric to be used in clothes, sheets and other cotton products to be sold into countries such as Australia. There are 14 countries where cotton is produced using child labour. Child workers in the cottonseed industry are often in a state of debt bondage and work at least nine hours a day. Pesticides used during production cause health problems for the children and they report experiencing headaches, convulsions and respiratory problems. The long-term effects of exposure to toxic chemicals have not been measured.