Could do better: Australia only 13th in the world's 20 least-corrupt nations

Australia has remained in 13th spot on Transparency International's Corruption Perceptions Index.

Denmark tops the list of least-corrupt nations Source: AAP

The annual Index assesses levels of public sector corruption in 180 countries.

While Australia hasn't dropped any places since last year, some say it's failure to climb the ranks reflects a need for stronger anti-corruption measures.