Public debt is the cumulative total of all Government Borrowings less repayments.
The figures used were based in US$ at the exchange rate relevant at the time.
These are the rankings for the main countries relevant to me.
| RANK | COUNTRY | Public debt as % OF GDP | DATE |
| 20 | Canada | 72.3% | 2009 est. |
| 22 | United Kingdom | 68.5% | 2009 est. |
| 27 | Ireland | 63.7% | 2009 est. |
| 42 | United States | 52.9% | 2009 est. |
| 90 | New Zealand | 29.3% | 2009 est. |
| 106 | Australia | 18.6% | 2009 est. |
The above countries with US$ comparison figures, using the GDP’s at official Exchange Rates.
Full list can be seen at: www.abcdiamond.com/public-debt-per-country