The seasonally adjusted data show that the country's industrial production in May rose by 2.7% from April and working-day adjusted figures show a rise of 4.4% year-on-year.
This was the highest rise since December 2014. In April, industrial output increased by 1.2% on the year.
Analysts forecast that industrial output will go up by 1.5% overall in 2015.
In 2014, industrial output rebounded 1.3% compared to 2013. This was the first positive growth in industrial production after five years of its decline.