The summarized Index of Eight Core Industries with 2004-05 base of 100:

The Index of Eight core industries having a combined weight of 37.9% in the Index of Industrial Production stood at 131.50 in September 2011 with a growth rate of 2.3% compared to its growth at 3.3% in September 2010. During April to September 2011-12, the cumulative growth rate of the Core industries was 4.9% as against their growth at 5.6% during the corresponding period in 2010-11.

Coal
Coal production (weight: 4.38%) registered a growth of (-) 17.8% in September 2011 compared to its growth at (-) 1.8% in September 2010. Coal production grew by (-) 4.8% during April-September 2011-12 compared to its growth at 0.2% during the same period of 2010-11.

Crude Oil
Crude Oil production (weight: 5.22%) registered a growth of 0.1 % in September 2011 compared to its growth at 12.5% in September 2010. Crude Oil production registered a growth of 5.1% during April to September 2011-12 compared to its growth at 10.2% during the same period of 2010-11.

Natural Gas
Natural Gas production (weight: 1.71%) registered a growth of (-) 6.4% in September 2011 compared to its growth at 12.6% in September 2010. Natural Gas production registered a growth of (-) 8.5% during April to September 2011-12 compared to its growth at 25.2% during the same period of 2010-11.

Petroleum Refinery Products
Petroleum refinery production (weight: 5.94%) had a growth of 4.4% in September 2011 compared to its growth at (-) 10.2% in September 2010. Petroleum refinery production registered a growth of 4.7% during April to September 2011-12 compared to its 2.6% growth during the same period of 2010-11.

Fertilizers
Fertilizer production (weight: 1.25%) registered a growth of (-) 2.1)% in September 2011 against its growth at 0.3% in September 2010.Fertilizer production grew by 0.6% during April to September 2011-12 compared to its growth at (-) 2.3% during the same period of 2010-11.

Steel (Alloy + Non Alloy)
Steel production (weight: 6.68%) had a growth rate of 6.6% in September 2011 against its 11.7% growth in September 2010. Steel production grew by 9.5% during April to September 2011-12 compared to its growth at 7.4% during the same period of 2010-11.

Cement
Cement production (weight: 2.41%) registered a growth of 0.9% in September 2011 against its 5.2% growth in September 2010. Cement Production grew by 2.5% during April to September 2011-12 compared to its growth at 4.7% during the same period of 2010-11.

Electricity
Electricity generation (weight: 10.32%) had a 8.9% growth in September 2011 compared to its 2.1% growth in September 2010. Electricity generation grew by 9.3% during April to September 2011-12 as against its 4.1% growth during the same period of 2010-11.