But that's the context in which I read this:
In Sub-Saharan Africa, the trend has been rather different. In 1961, the number of tractors in use was more than in both Asia and the Near East (at 172 000). After that the number increased slowly to peak at 275 000 by 1990 before declining to 221 000 by 2000.In other words, sub-Africa had fewer tractors in 2000 than the US had in 1920. Further, the population of Africa was about 600 million, while the population of the US was about 100 million.