According to Istat, in April 2011 the seasonally adjusted index of industrial production increased by 1.0% compared to March. In the quarter February to April the index rose by 1.1% on average, compared to the immediately preceding quarter. Adjusted for calendar effects, in April the index rose in trend terms by 3.7% (working days were 20 against 21 in April 2010). In the first four months of this year the average production increased by 2.5% over the same period last year. The index corrected for calendar effects recorded in April 2011 a sustained trend growth for clusters of capital goods (+6.1%) and intermediate goods (+5.9%). More limited is the increase of consumer goods (+1.4%), while decreases the production of energy (-3.4%). Comparing trends, the manufacturing sectors characterized by a marked growth are: manufacture of machinery and equipment nec (+14.4%), manufacture of rubber and plastics, other non-metallic mineral processing ( +9.0%), metallurgy and manufacture of fabricated metal products except machinery and plants (+7.9%). The industrial sector that marks the greatest declining trend in April is the manufacture of computer, electronic and optical products, electro-medical appliances, clocks and measuring equipment (-6.9%).