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According to Statistics Canada, Canada’s exports and imports of energy (combined totals of fossil fuels, hydro, and nuclear, all measured in petajoules) over a five-year period were as follows:YearExportsImports201211 2253706201311 6873550201411 8213262201512 2193447201612 5073659a. Using 2012 as the base year, construct index numbers for each of exports and imports.b. Were exports or imports more volatile over this time period? Explain how you know.c. Using your constructed index numbers, what was the percentage change in exports and imports from 2014 to 2016?