The Producer Price Index (PPI) by economic activity (ISIC classification) for the period from the beginning of the year to the corresponding period of the previous year measures the cumulative change in producer prices since the start of the current year compared with the same period last year. It is used to analyze average year-to-date price dynamics, identify inflationary trends in the production sector, and assess cost changes across industrial activities such as mining, manufacturing, energy supply, and utili