it's worth noting that the first bar-graph (in particular) is raw #, not scaled for program size, which obviously varies between the listed programmes and departments; and that these show standing faculty, not new hires; hence the chart broken down into rank may be more useful: the visiting and associate professor categories would (i imagine) give a better sense of the recent placement rates of different programmes.
for these reasons (among others) these stats are perhaps interesting less as a projective or predictive assessment and more as a demographic study of current departments -- which seems to be how they were intended, and thanks to jon for that.