I've had a quick flick over the list and some of the foreign language congs no longer exist and have been absorbed into neighboring congs as a foreign language group.
For example the Maltese, Yugoslav in Melbourne no longer exist, I believe the same is true of Filipino and Greek as far as I'm aware. There may well be others also.
Hence the number discrepancy.
I just wonder if the local elders signed up as an individual charity or the watchtower in Australia just signed them all up??