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The index measures the monthly evolution of the volume of industrial production (excluding construction). Since January 2009 the indices have been calculated with reference to the base year 2005 using the new Ateco 2007 classification (Italian edition of Nace Rev. 2).
In December 2011 the industrial production index seasonally adjusted increased by 1.4% compared with the previous month. The percentage change of the average of the last three months with respect to the previous three months was -2.1.
The calendar adjusted industrial production index decreased by 1.7% compared with December 2010 (calendar working days being 20 versus 22 in December 2010); in the average of 2011 the percentage change was unchanged compared to the average of the previous year.
The unadjusted index of industrial production decreased by 7.7% compared with December