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In the month of September the highest increases in prices were observed in raw materials derived from petroleum derivates (3.6%), asphalt products (3.0%), glass (1.6%) and lime, gypsum and plaster (1.0%), among others. On the other hand, there has been a decrease in prices of the following raw materials: electric power (-5.1%), iron and steel (-2.5%), and metal piping (-1.2%), among others.
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