Eight Core Industries comprise nearly 38% of the weight of items included in the Index of Industrial Production (IIP). 

Coal production increased by 13.4 % in August, 2014 over August, 2013. Its cumulative index during April to August, 2014-15 increased by 7.2 % over corresponding period of previous year while Crude Oil production declined by 4.9 % in August, 2014 over August, 2013. The cumulative index of Crude Oil during April to August, 2014-15 declined by 1.2 % over the corresponding period of previous year.

The Natural Gas production declined by 8.3 % in August, 2014 over August, 2013. Its cumulative index during April to August, 2014-15 declined by 5.8 % over the corresponding period of previous year.

Petroleum refinery production declined by 4.3 % in August, 2014 over August, 2013. Its cumulative index during April to August, 2014-15 declined by 2.7 % over the corresponding period of previous year.