How did the quantity of raw materials used by the central powers and allied powers changed over time?

Over time more and more was used so the quantity was reduced.

Explanation:

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Explanation:

Between 1911 and 1913, more than 80 percent of the main imports of the industrial western countries (Great Britain, Germany, France and the United States) consisted of raw materials and foodstuffs. The Allies increased their blockade of the Central Powers throughout the war

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