So
//In 1956, the index of industrial production expanded to include the output of electric and gas utilities along with the measures for manufacturing and mining. These three sectors continue to be the main components of the index today.
So
//In 1956, the index of industrial production expanded to include the output of electric and gas utilities along with the measures for manufacturing and mining. These three sectors continue to be the main components of the index today.
This would make so much more sense if a few of the 300 sectors that comprise the index were inclcuded... like mining with a 1919=100 weight
https://www.federalreserve.gov/releases/g17/100_years_of_ip_data.htm
