[interroboink]

> those numbers make no sense.

Perhaps in the sense of "on average, families have 1.6 children" (or whatever it is) ­— i.e, these are aggregate numbers, not to be taken as specific examples of actual households. Interpreting statistics can be tricky like that.

Also, to be fair, that study (I briefly looked) just lists toilet per-capita GPD in the quoted section ("Daily Per Capita Use"); it does not equate it to a number of flushes. They do have a whole section devoted to toilet flushes though — see "ULF Toilet Savings".