Tractors have a skewed distribution, which splits the regions of the world into two groups. The people living in the larger group of regions have an average of fewer than four tractors per thousand people. People living in the other group of regions have more than thirteen tractors per thousand people. Thus the rate of tractor ownership in one group of regions is at least three times higher than that in the other group of regions. The top ten territories for tractor ownership are all European, the bottom ten are mainly African.
It is important that this is a count of working tractors because broken tractors are not useful to farmers.