I have 45 of them.
View attachment 1408433
4 different stacks of 10 measured:
36.38mm
36.14mm
35.94mm
36.25mm
I think one big reason for the discrepancy in stack size is that a number of plaques are very slightly bowed, so depending on how the are arranged, different thicknesses of the stacks will result.
The yellow $25k plaques in the background are even more cupped, so that depending on how they are arranged, thickness of a group can be wildly different.