July 3 2009 Call Volumes

I am curious what other centers are projecting for call volumes for July 3 this year as it is a U.S. Federal holiday. Please share your industry and how much you think your volumes will drop from a normal Friday. We are a national medical equipment provider order taking center and are anticipating only a 30-40% drop vs. 70-80% when July 4 is a weekday holiday. Thanks!