Division 2: Numbers of installations and permits (Article 2(3) and 2(4) and Article 4) - Commission Implementing Decision of 21 September 2011 establishing a questionnaire to be used for reporting on the implementation of Directive 2008/1/EC of the European Parliament and of the Council concerning integrated pollution prevention and control (notified under document C(2011) 6502) (Text with EEA relevance) (2011/631/EU)