What is circulation and annual revenue of Playgirl magazine and how
has it changed over time in the past 5-10 years?

In the U.S. all periodicals are required to publish those figures once
a year. Look though one full year of issues and you'll find them.
After you find it, it's usually the same month each year. Most main
libraries in cities will have Playgirl but you'll have to ask for it.