The provided source material does not contain statistics on Australian bankruptcy filings for 2011. To obtain this specific figure, you would need to consult:
Australia's bankruptcy numbers fluctuate with economic cycles. The post-GFC period (2009–2012) saw elevated personal insolvencies, with annual totals typically ranging between 20,000–30,000 during that era. However, without the exact 2011 figure in the source, any specific number would be speculative.
Visit afsa.gov.au and search their "Statistics" section for the precise 2011 annual report, which breaks down bankruptcies, debt agreements, and personal insolvency agreements by state, age, gender, and cause.