“The London-based International Center for the Study of Radicalization and Political Violence reports that between 100 and 250 Australians have joined Sunni militants in Iraq and Syria. Given Australia’s vast distance from the region and its population of just 24 million, it is a remarkable number. The center estimates that about 100 fighters came from the United States, which has more than 13 times as many people as Australia.”
Source: Australia a puzzling hotbed of Islamic State recruiting – Pacific – Stripes