It's late at night and I don't have the reference at hand, but ...
From memory the Australian National Debt/GDP ratio has not exceeded 4% in the last five years.
By comparison the USA Debt/GDP ratio is about 140% and Greece about 300%.
Australian government debt is tiny and very manageable.
The Australian Government debt ratios are probably the best in the world.
I'll check with with definite figures and references on the weekend when I have time.