Estimated Resident Population (ERP) is the official measure of the Australian population. ERP for sub-state regions (including SA2s and LGAs) is published annually, with a reference date of 30 June. ERP is the official measure of the Australian population, based on the concept of usual residence. It refers to all people, regardless of nationality, citizenship or legal status, who usually live in Australia, with the exception of foreign diplomatic personnel and their families. It includes usual residents who are overseas for less than 12 months over a 16-month period. It excludes those who are in Australia for less than 12 months over a 16-month period. Data is final for 1991 to 2011, revised for 2012 to 2014, and preliminary for 2015. Data sourced from: http://stat.abs.gov.au/. Refer to the source data for further information: http://www.abs.gov.au/AUSSTATS/abs@.nsf/Explanatory%20Notes/3218.0. For further information about these and related statistics, contact the National Information and Referral Services on 1300 135 070. Periodicity: Annual. Data current as of 30/03/2016.