By last count in 2016, the world saw just 37 new cases of polio. That's down from more than 400 in the late 1980s But the graph's y axis says "thousands". From

By last count in 2016, the world saw just 37 new cases of polio. That's down from more than 400 in the late 1980s But the graph's y axis says "thousands". From 400,000 to 37 is a bit more meaningful than from 400 to 37.