1960      1970      1980      1990      2000      2010


  FORTRAN            C          C++        Java
                                           JavaScript

     COBOL                             Python


            BASIC                        Ruby


                                    Perl    PHP

                     sh               bash  ksh

                            csh
                              tcsh
oreilly.com/pub/a/oreilly/news/languageposter_0504.html
en.wikipedia.org/wiki/Programming_language
radar.oreilly.com/archives/2006/08/programming-language-trends.html