Here is an industry stat I found today. Who knows if it is true or how it came to be but ya ....
According to the Los Angeles Public Health Department, in 2005 alone, there were an estimated 200 adult film companies (5-10 of which did half of the films) and 6,000 workers (1,200 of whom were porn actors) in Los Angeles County.
Got it from an article here
http://www.********.com/read.php?ID=48450