The IEEE ranks these programming languages by how much general usage they are getting. Their methodology combines information about the activity of the language’s user base in social media, the number of open source projects using the language, the demand for programmers in the language and their salaries, and so forth. It’s a bit of a heat map, I guess. What’s hot — where the jobs are, where the money is, and where the enthusiasm is highest. Or, lowest. Not meant to be a measure of value.
The big application workhorses are still smoking hot. Assembly is hotter than Perl! Haha! I’m interested to see Go high up the list, at 13. I was just reading up on it last week. Some friends are missing altogether — Dart, Groovy, Elixir. Maybe, next year. HTML — that’s so old skool! Not even top-20 anymore.