The U.S. Department of Commerce publishes a series of census documents referred to as Current Industrial Reports. Included in these documents are the manufacturers€™ shipments, Inventories, and orders over a 5-year period. Displayed here is a portion of these data representing the shipments of chemicals and allied products from January of year 1 through December of year 5. Use time-series decomposition methods to develop the seasonal indexes for thesedata.

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and Allied Products and Allied Time Period($ billion) Time Period($ billion) January (year) 23.701 January (year 2) 23.347 February 24.189 February 24.200 March 24.971 April 24.560 May 24.992 une 25.282 25.426 June Chemicals and Allied 24.088 24.672 26.072 September October November December 24.037 August 25.047 September 24.115 October 23.034 November 22.590 December Time Period ($ billion) 23.826 January (year 5) 24.373March 30.456 32.372 30.905 30.743 32.794 February January (year 3 24.207 January (year 4) 25.316 February 25.772 February 27.591 March 26.958 April 25.920May 28.460 June 24.821 July 25.560 August 27.218 September 25.650 October 25.589 November 25.370 December 26.435 29.346 June 28.424 30.149 September 26.746 October June 30.206 November 30.783 December 28.594 September October November December