The index measures the monthly evolution of the volume of industrial production (excluding construction). With effect from January 2013 the indices are calculated with reference to the base year 2010 using the Ateco 2007 classification (Italian edition of Nace Rev. 2).
In September 2014 the industrial production index seasonally adjusted decreased by 0.9% compared with the previous month. The percentage change of the average of the last three months with respect to the previous three months was -1.1.
The calendar adjusted industrial production index decreased by 2.9% compared with September 2013 (calendar working days in September 2014 being 22 versus 21 days in September 2013); in the period January-September 2014 the percentage change was -0.5 compared with the same period of 2013.
The unadjusted index of industrial production increased by 0.1% compared with September 2013.