You really need to change Perl to Scala for increasing salary. First, in 2020 Perl and Scala were tied in the world ranking and Scala was much higher than Perl in the US. Second, if you go back through earlier StackOverflow surveys you will see that Perl wasn't really high on the list, but Scala has been the top paid, or tied for top paid, language every year that StackOverflow has asked about salaries. I strongly encourage you to make this edit to the article and change that section to reflect that language that has been the top earner for many years instead of a language that happened to tie it one year.