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The simultaneous introduction of two rotation groups per month between May and August 2013 resulted in a lower proportion of the sample being matched during this period. In June 2013, a new sample for the more remote, less populated areas and non-private dwellings was introduced for Tasmania, Northern Territory and the Australian Capital Territory. The new sample for the same categories in New South Wales, Victoria, Queensland, South Australia and Western Australia was introduced in July 2013. These changes are reflected in smaller estimates in the gross flows.