RFI: Calculated orbital decay rate of an unbooster ISS?

On Jun 17, 4:13 pm, OM wrote:
...Has anyone done any estimates of roughly how long ISS could remain
in orbit without any boosts from the Shuttle, Soyuz or Progress
resupply missions? The issue has come up over on a BSG group, and I
actually haven't been able to find anything on the NASA sites about
this.

I seem to recall something about that from Post-Columbia days, when
some of the end-time scenarios were being sketched. I don't recall
that there were any numbers published, though.

/dps