Most of the popular scripting languages have shown steady growth over the last six quarters, with one exception, Perl. For some reason, Perl has seen about a 10% decline over the period analyzed. Along with every other language, the movement is not drastic, yet noteworthy based on the overall data. It peaked in early 2016 at nearly 1,900 requests per 10,000 job listings. It now finds itself just below 1,700. As for the reason why this has taken place, your guess is as good as mine. Whatever the rhyme or reason, corporation's are not asking for it as much presently.
The one scripting language that garners the largest numbers and is still in growth mode is Python. Whereas Perl has declined by about 10%, Python has seen growth of a little over 10% during the last year and a half. Its reading as of January 2016 registered in at 2,566 out of 10,000 listings. As of April 2017, the number of listings requiring Python skills has increased to 2,826. The numbers in between have been a little haphazard, but at the end of the day, the trajectory is moving upward.