Australia's Net Foreign Debt as a Proportion of GDP Has

Australia's net foreign debt as a proportion of GDP has

A) fallen from 50 per cent in the 1970s to less than 20 per cent by 2013.
B) risen from approximately 20 per cent in the 1970s to over 30 per cent by 2013.
C) risen from less than 5 per cent in the 1970s to over 50 per cent by 2013.
D) risen from approximately 30 per cent in the 1970s to approximately 40 per cent by 2013.