https://carsafe.com.au/risk-rating#
FPV GT BA: Oct. 2019: 1378 Licensed.
FPV GT BF: Oct. 2019: 1437 Licensed.
FPV GT FG: Oct. 2019: 3070 Licensed.
FPV F6 FG: Oct. 2019: 1548 Licensed.
It looks like this database has added together all variants for example GTP, GTE, GTF seems to be part of the 'GT' numbers. Also for FG all years 08 to 14 are added together.
There are probably some cars stowed away without plates on them, and some states have <100, so they don't show in the numbers above.
There would be a number of cars that have been written off, and scrapped. For example the BF typhoons have less than 1000 now since it is no longer listed. (More than 400 cars lost compared with production numbers).
Cheers,