Industry ratios are commonly used to evaluate the operating efficiency and profitability of a industry (or company). The resources listed to the right are good places to begin. Try to be consistent when obtaining ratios, for example, use ratios from the same year. In doubt, ask your professor!
Detailed national and global industry reports that provides a narrative of the industries, performance, outlook, along with infographics, industry financial ratios, stats, etc. Reports are updated every 6-12 months.