In most places, millimeters. In *some* places, centimeters. (was my understanding).
Some of that also has to do with tides bringing water into the water table (and back out) on a daily basis, which causes expansion and contraction as well. I think Whitney would more likely be millimeters. Because; granite.
I should write a grant proposal to get funding to bring one of those fancy $10,000 GPS receivers up there, to collect data for a few days. Not that that would settle any arguments.
