How is this state even determined? If we exclude Facebook & Wikipedia how much market share is left after that? I ask as the statistic seems to be projecting

How is this state even determined? If we exclude Facebook & Wikipedia how much market share is left after that? I ask as the statistic seems to be projecting that it is the most popular amongst people, but it feels like it is a legacy language. Maybe adding in how much new server unrelated to the legacy apps are written in PHP would be a good contrast.