Discrepancies between Reference and Sectoral Approach estimates and the difference in the resulting growth rates arise from statistical differences between supply and consumption data for oil and natural gas. For Norway, supply of these fuels is the residual of two very large and opposite terms, production and exports.
The sectoral breakdown for gas/diesel oil used in the residential sector before 1978 was estimated on the basis of commercial and residential consumption in 1978 and the data reported as commercial consumption in the energy balance in previous years.
For reasons of confidentiality, gas for main activity electricity is included in autoproducers for 1990.
A detailed sectoral breakdown is available starting in 1980.
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