Financial ratios show the mathematical relationship between two numbers related to an industry's performance. Once a ratio has been calculated according to the relevant formula, the ratio can be used to help determine how well a particular industry is doing.
Databases such as Capital IQ give industry data by sector performance. The following screengrab illustrates this:
And when exploring each sector, for example Health Care, it gives the Constituent Performance in terms of Market Cap, Price, Volume, Total Revenue, etc.
Here's how to find industry ratios in various SMU Libraries databases: