The output, as measured by the Index of Industrial Production (IIP), had contracted by 2.5% in the same month of last year.
IIP data for April remained unchanged at 3.4% after revision of the provisional estimates released last month, according to the information released by the Central Statistics Office (CSO).
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The IIP's previous high was recorded in October 2012 at 8.4%.
During the April-May period of the current fiscal, the IIP recorded a growth of 4%, as against contraction of 0.5% in the first two months of 2013-14.
Manufacturing, which constitutes over 75% of the index, grew 4.8% in May, compared to decline in output by 3.2% a year ago. For April-May, the sector recorded a growth of 3.7%, compared to a contraction of 0.7% in the year-ago period.
Production of capital goods, a barometer of demand, grew by 4.5% in May, in sharp contrast to a contraction in output by 3.7% in same month of last year.
For April- May, the output has grown by 9.3%, compared to the contraction of 2.1% in the first two months of 2013-14.
The mining sector grew by 2.7% in May as against a dip of 5.9 per a year ago. For April-May, the segment grew by 2.6%, compared to decline in production by 4.7% in the year-ago period.
Power generation increased by 6.3% in May as compared to 6.2% growth in the same month of 2013. In April-May, power output grew by 9% compared to a growth of 5.3% in the year-ago period.
Overall, 16 of the 22 industry groups in manufacturing showed positive growth in May.