This chart plots the "share" of each question on the site, so the total is always 100%. If you read the chart from left to right you will see that the language

This chart plots the "share" of each question on the site, so the total is always 100%. If you read the chart from left to right you will see that the languages whose share increases become wider while those whose share decreases become narrower. It can be a bit difficult to read with this many options.