These graphs show the "connections" between offices. Two offices are considered "connected" if they both were held by an individual one after the other; in effect, a "connection" describes a step in an individual's movement from one position to another. At some (perhaps anachronistic) level, we might view these graphs as graphs of "career paths". To reduce some of the noise in the graphs, I show only "connections" (i.e., individual people's movement from one office to another) when such a "connection" is found more than four times in the database.
The graphs:
