This is raw data for survey about usage of programming languages:
    http://dou.ua/lenta/articles/language-rating-jan-2015/
    http://dou.ua/lenta/articles/language-rating-jan-2014/
    http://dou.ua/lenta/articles/language-rating-jan-2013/
    http://dou.ua/lenta/articles/language-rating-1h2012/
    http://www.developers.org.ua/lenta/articles/programming-languages-rating-2011-07/
    http://www.developers.org.ua/archives/rssh/2010/12/14/programming-languages-rating-2010/



 2010_12/questionnaire1.csv -- data.
 2010_12/questionnaire1.r   -- r scripts, to produce some graphics and results.
 2011_07/questionnaire2.csv -- data.
 2011_07/questionnaire2.r   -- r scripts, to produce some graphics and results.
 2012_05/questionnaire3.csv -- data.
 2012_05/func.r           -- common r functions.
 2013_01/questionnaire4.csv -- data [Jan 2013]
 2014_01/questionnaire5.csv -- data [Jan 2014]
 2015_01/questionnaire6.csv -- data [Jan 2015]
 2016_01/questionnaire7.csv -- data [Jan 2016]
 r/              -- R scripts and classes 
 
 Survey data is made available under the Open Database License: http://opendatacommons.org/licenses/odbl/1.0/. Any rights in individual contents of the database are licensed under the Database Contents License: http://opendatacommons.org/licenses/dbcl/1.0/
 Any public mention of derived product must contain reference to the original survey.

 R scripts for analysis are avialable under GNU General Public License v.3 or later.