United States - Relative Importance Weights (Contribution to the Total Industrial Production Index): Materials was 45.30% in March of 2024, according to the United States Federal Reserve. Historically, United States - Relative Importance Weights (Contribution to the Total Industrial Production Index): Materials reached a record high of 51.05 in June of 1981 and a record low of 41.29 in January of 2002. Trading Economics provides the current actual value, an historical data chart and related indicators for United States - Relative Importance Weights (Contribution to the Total Industrial Production Index): Materials - last updated from the United States Federal Reserve on April of 2024.