Sustained interest from global central banks to prevent the Australian dollar efforts of the Reserve Bank of Australia to curb power of the national currency . Westpac Banking Corp., The second largest underwriter of bonds of the country , said that the number of central banks that allocate their funds in Australian currency and assets denominated in it tripled to 60 in the last three years . Central banks bought more than a quarter of the 2033 Australian government bonds offered to investors last week, a spokesman for the country on November 20. The Central Bank of South Africa this month joined his colleagues , stating that he would like to add the Australian currency in its reserves .Documents published in February , showed the RBA estimated that about 34 central banks of the world had the Australian dollar in its gold and foreign exchange reserves. Among them - China, France , Germany , India , Slovakia and Slovenia . Australian bonds are among the most high-yielding securities the major developed economies of the world . 10-year government bonds yield 4.30 percent in income annually. Similar U.S. Treasuries bring 2.76 percent per annum .