FIGURE 1. Annual growth rate of cereal yields and sown area in developing and developed countries, 1977–2001.
From the following article:
Enhancing the crops to feed the poor
Jikun Huang, Carl Pray and Scott Rozelle
Nature 418, 678-684(8 August 2002)
doi:10.1038/nature01015
Data from Food and Agriculture Organization of the United Nations.