<h1>Core Industries Growth Slows to 3.1% in December 2011; Electricity Sees Notable 9.2% Cumulative Increase.</h1> The Index of Eight Core Industries, which constitutes 37.90% of the Index of Industrial Production, recorded a growth of 3.1% in December 2011, down from 6.3% in December 2010. From April to December 2011-12, the cumulative growth was 4.4% compared to 5.7% in the previous year. Coal production grew by 5.6% in December 2011 but had a negative cumulative growth. Crude oil and natural gas production declined, while petroleum refinery products and fertilizers showed modest growth. Steel, cement, and electricity production increased, with electricity showing significant cumulative growth of 9.2% compared to 4.7% in the previous year.