Prostitution. Via Shutterstock.

$11,588. That’s how much a pimp in D.C. averaged a week between 2005 and 2011, according to a new study conducted by the Urban Institute.

The study examines the economics of the underground commercial sex industry in seven different cities—Atlanta, Dallas, Denver, Miami, San Diego, Seattle, and Washington, D.C.—in 2003 and 2007. And between those years, D.C.’s underground sex industry decreased by 34 percent, from $155 million to $103 million. It was the biggest drop out of all the cities included in the study, which found that the cities with the two largest sex economy growths were Seattle and Atlanta (they took in $112 million and $290 million, respectively).

For their study, researchers at the Urban Institute interviewed a number of people involved in the sex industry—pimps, prostitutes, and police—in each city to reach their findings. In D.C., it found that the underground sex industry pretty much takes place through certain websites, Latino brothels, street prostitution, and Asian massage parlors that give, um, “happy endings.”

Among the biggest revelations about the D.C. underground sex industry from the study? Pimps are pulling in a lot of money. Charging an average of $200 for as little as 15 minutes with a sex worker, most pimps rake in about $1,000 a weekend, according to local police.

The report also found that most pimps are recruiting sex workers from scouting at transportation hubs, like Union Station. “On a Tuesday afternoon in DC, a bus screeches to a halt inside the Union Station bus terminal, and off steps a 17-year-old black female,” a summary of the report reads.”Desperate to escape her former life, her hopes for a better future propel her to the nation’s capital. But where she dreams of starting anew, others wait inside the bus station for the chance to exploit her femininity, economic desperation, family problems, low self-esteem, or history of sexual victimization.”

You can read a summary of the report here, or if you’re curious and have a lot time on your hands, you can read the full report here.