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 September 2011 the industrial production index seasonally adjusted decreased by 4.8% compared with the previous month. The percentage change of the average of the last three months with respect to the previous three months was -0.1.
The calendar adjusted industrial production index decreased by 2.7% compared with September 2010 (calendar working days in September 2011 being the same as in September 2010); in the period January-September 2011 the percentage change was +1.3 compared with the same period of 2010.
The unadjusted index of industrial production decreased by 2.7% compared with September 2010.
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