This guide provides current statistics on immigration detainees in Australia (onshore) since 1989/90. It updates the appendices of a more detailed Parliamentary Library research paper, Immigration detention in Australia (2013). The research paper includes an overview of the historical and political context surrounding mandatory immigration detention (introduced by the Keating Government in 1992) and details of Australian Government immigration detention policy responses between 1976 and 2013. For an update on immigration detention policy since 2013 see the Parliamentary Library research paper, A comparison of Coalition and Labor government asylum policies in Australia since 2001 (2017).