Seems that stats are found all over the effing place.
BITRE statistics from the annual surveys
General Aviation Activity are not reported on a location basis, (but it is absolutely
fascinating to know that in 2013 there were 3 Aquila aircraft that did 1.6 hours of training)
The Airservices stats at
Movements at Australian airports ? archive | Airservices are organised on a monthly basis. sigh....
From the 2014 BAL preliminary draft master plan they say an average of 500 movements per day.
There are small graphs in that document and a table further in, that show a peak of 370000ish movements in 2008ish and a trough of 240000ish in 2004ish.
The 2012ish value is about 180000ish.
(
you try reading those freaking graphs and see what you get)