Within 2 years after October 11, 1996, and at least once every 2 years thereafter, the Secretary of Commerce shall prepare and submit to the Congress and the Secretary a report examining whether operation of the Council, in conjunction with the cumulative effects of market changes and Federal programs, has had an effect on propane consumers, including residential, agriculture, process, and nonfuel users of propane. The Secretary of Commerce shall consider and, to the extent practicable, shall include in the report submissions by propane consumers, and shall consider whether there have been long-term and short-term effects on propane prices as a result of Council activities and Federal programs, and whether there have been changes in the proportion of propane demand attributable to various market segments. To the exten