In the 'Index of Eight Core Industries', which one of the following is given the highest weight?

The 'Index of Eight Core Industries' is a production volume index that measures the performance of eight key infrastructure industries in India: Coal, Crude Oil, Natural Gas, Refinery Products, Fertilizers, Steel, Cement, and Electricity. These industries together account for a significant portion of the Index of Industrial Production (IIP). Among these eight, electricity generation typically holds the highest weightage in the index, reflecting its critical role as an input for almost all other economic activities and its substantial contribution to industrial output. The weightages are revised periodically, but electricity has consistently remained the highest or among the highest.