Australian Dollar

Australian Dollar

Carla Gottgens/Bloomberg

The Aussie, the world’s fifth-most-traded currency, reached a three-year low of 88.48 cents on Aug. 5. Its 8.3 percent drop in 2013 is the second-biggest decline among 10 developed-market currencies tracked by Bloomberg Correlation-Weighted Indexes, trailing only the yen’s 10 percent plunge.