You'll find a much better metric here: http://www.indeed.com/jobtrends?q=perl%2C+python%2C+php%2C+ruby&l= http://www.indeed.com/jobtrends?q=perl%2C+python%2C+ph

You'll find a much better metric here: http://www.indeed.com/jobtrends?q=perl%2C+python%2C+php%2C+ruby&l= http://www.indeed.com/jobtrends?q=perl%2C+python%2C+php%2C+r... Absolute number of jobs for each language.