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Hi Amany,
Historical Production (for any Transformation branch - refineries, electricity production, etc) refers the the annual production or output from the process during the years leading up to the First Simulation Year. So, in your case, if would be the energy output of petroleum products in each year.
Have a look here for a little bit more information:
http://www.energycommunity.org/WebHelpPro/Transformation/Base_Year_Output.htm
Hope this helps,
Taylor