Member governments submit annual oil demand data about six months after the end of the year. Following the receipt of this information, the differences between these annual data and the aggregate of the twelve corresponding MOS data are used to adjust the monthly data used in the report for the relevant year and the same adjustments are used to correct MOS data relating to the next year. Annual non-OECD data are obtained from a wide range of sources including governments, industry and international organisations such as the United Nations, ASEAN, OLADE, the OPEC Secretariat and APEC. Monthly and quarterly non-OECD data are adjusted using the same procedure as for the OECD once the annual data become available. However, final annual data are generally only available for the year (12-18 months before the current year) and, therefore, adjustments have to be made to historical data and forecasts. The adjustments also tend to be larger in percentage terms and, in some cases, need to include estimates of bunker fuel demand or refinery fuel use which were missing from the original data.

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