I don't think I'd even trust that measure.
In roundish numbers, 30% of Australian consumed pig meat is imported, while around 10% of domestic production is exported.
From Australian Pork -- Import, Export & Domestic Production Report, January 2016 Market Reporting | Australian Pork
12 month totals to January 2016
Domestic pig meat production -- 372,508 (tonnes)
Exports -- 33,380 (tonnes)
Imports -- 170,270 (tones)
Data Source: ABS