The output of eight core sectors grew 8.9 per cent in June, mainly due to a low base effect and uptick in production of natural gas, steel, coal and electricity, official data showed on Friday. The eight infrastructure sectors of coal, crude oil, natural gas, refinery products, fertilisers, steel, cement and electricity had contracted by 12.4 per cent in June 2020 due to the lockdown restrictions imposed to control the spread of coronavirus infections.