How much money does a regular interior designer make a hour?

I am an 'entry level' interior designer in that I have been practicing in residential and commercial design for three years. On freelance jobs, I charge my clients $75/hour which is considerably low. I am working a contract job for an interior design firm that is billing me out at $85/hour, and I'm pretty sure my full-time job bills me out at $110/hour. I did find a website that says, "the going rate in 2005 is anywhere from $65 to $120 per hour". I am sure that has raised a bit though since 2005. I would budget for at least $80/hour to play it safe. Also, remember that this is a very serious job. The time you think it would take to 'pick a couple' colors is actually quite more detailed than that. So, talk to your potential designer about how many hours they expect the project to take.