Hi Gail. Based on your question it seems that you want an annual membership figure for a specific gym. Because the amount varies State-to-State, City-to-City, and even gym-to-gym the way to get the best answer for your question is to directly call the specific gym that are interested in joining.
I suspect that it varies depending on your geographical location. Bigger cities, higher cost. Smaller cities, lower cost. Best advice, put the cost into the equation of how many times/week do you expect to use your membership. That would be good way to determine if it is a good invesment for youl.