I asked ChatGPT -- Please estimate the popularity of these languages, relative to the most popular one (that gets 100%). Base your answer on community activity on different platforms (stackoverflow, reddit, hacker news, dev.to, github) and the number of books available and sold: COBOL, Perl, PHP, BASIC, TCL, ColdFusion.

Estimated popularity:

    PHP: 100% (reference)
    Perl: 30%
    COBOL: 25%
    BASIC: 10%
    TCL: 8%
    ColdFusion: 5%

(I consider all of these dead, or, "in maintenance mode")