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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 April 2012 the industrial production index seasonally adjusted decreased by 1.9% compared with the previous month. The percentage change of the average of the last three months with respect to the previous three months decreased by 2.5.
The calendar adjusted industrial production index decreased by 9.2% compared with April 2011 (calendar working days being 19 versus 20 days in April 2011); in the period January-April 2012 the percentage change was -6.6 compared with the same period of 2011.
The unadjusted index of industrial production decreased by 11.9% compared with April 2011.