[ultrasaurus]

No political angle, but to expand on the data from that report (pages 22-23):

* Sixty-nine percent (69%) ... were living in San Francisco at the time they most recently became homeless... 8% had lived in San Francisco for less than one year.

* Of their previous living arrangements: 32% with friends or family, 11% in subsidized housing, 8% in a hotel, 6% incarcerated, 3% in hospital, 3% in foster care.

So it's probably more accurate to think of at most 50% of the population as having come from stable housing situations in SF.