A federal agency has approved a new rule requiring that publicly traded companies disclose their annual salaries.

In anticipation of that eventual disclosure USA Today analyzed the pay of executives at Standard and Poor's 500 companies.

According to the USA Today report, the average CEO of an S&P 500 company makes 216 times the salary of an average worker.  The CEOs of nine companies make 800 times as much as their average employees.  USA Today used data from Glassdoor.com in compiling the analysis.

Topping the list is David M. Zaslav, the Presisdent and CEO of Discovery Communications.

The CEO salary disclosure rule, passed by the Securities and Exchange Commission by a vote of 3:2, takes effect in 2018.