Several readers have sent this, but since it doesn't control for frequency of publication, or the size of each volume, its results are worthless.  For example, Journal of Philosophy publishes about 24 articles per year; Synthese in recent years has published 150 articles or more per year.  (That Phil Studies comes in 2nd is more impressive, since while they publish more articles than J.Phil., it is only by a factor of two, if that.)

UPDATE:  Several readers point out that I miscounted on Phil Studies, which also publishes on the order of 100 articles per year.