That's a good question! I think that even in that case, the best answer would be to break things out so that people could see the different categories. The amount of code in production (this is something where langpop.com likely falls short: I can't think of any way of getting data on all the COBOL out there without paying through the nose for it) certainly counts for something in terms of popularity, but so does the language most people know some of. So does what's hot these days and being used for new systems being written.
I think, though, that ultimately it doesn't really matter once you get past a certain threshold and see that people are writing libraries for the language.
I think, though, that ultimately it doesn't really matter once you get past a certain threshold and see that people are writing libraries for the language.