| Released June 2009 
Attributes  by Data Reference Year 19911994199820022006**Frequency of Survey**Every 3 yearsEvery 3 yearsEvery 4 yearsEvery 4 yearsEvery 4 years**Sample Size**16,05422,92217,87715,50015,500**Industry  Classification Scheme**Standard Industrial Classification System (SIC)              SICNorth American Industry Classification System (NAICS)  overlapping with SIC systemNAICSNAICS
**Number of Industries Published****in Data Tables**
SIC                   20  2-digit major groups              42  3- and 4-digit industriesSIC                   20  2-digit major groups              52  3- and 4-digit industries
NAICS 21  3-digit industry subsectors36  4- and 6-digit industries SIC overlapping  with NAICS 20  2-digit 

NAICS21  3-digit industry subsectors48  4- and 6-digit industries 

NAICS21 3-digit  industry subsectors 58 4- and  6-digit industries
**Data Collection Mode**Mail QuestionnaireMail QuestionnaireMail QuestionnaireMail QuestionnaireWeb Based Questionnaire**Industry  Classification Scheme**Standard Industrial Classification System (SIC)              SICNorth American Industry Classification System (NAICS)  overlapping with SIC system              major  groups 10  4-digit industries NAICSNAICSAttributes  by Data Reference Year 19911994199820022006**Questionnaire  Content****Consumption (combustible and noncombustible)**OngoingOngoingOngoingOngoingOngoing**Natural Gas Purchases and Expenditures**
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Substantial increase, new sectionReducedOngoingOngoing**End-use Allocation**NewOngoingOngoingOngoingOngoing**Square Footage**New  Categorical answerChanged to actual square footageActualActualActual**Energy Management Activities**NewOngoingChanged emphasisOngoingOngoing**Technologies – General**NewOngoingOngoingOngoingOngoing**Technologies – Industry-specific**NewOngoingOngoingDropped--**Technologies – Cogeneration**--NewOngoingOngoingOngoing**Fuel Switching Capability**OngoingOngoingDroppedRestoredOngoing**Fuel Switching**--NewDropped--Restored**Practices**Between residual Fuel Oil and Natural Gas**Electric Motor Purchasing Practice**--NewDropped----**Number of onsite Buildings**----NewOngoingOngoing |
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