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3.13. Using the data sets in (b) and (c) as marginal controls, the census counts in (a) are adjusted in two stages:
3.14. Estimates of the number of Australian residents temporarily overseas on Census night, derived from data on residential addresses reported by these residents on returning to Australia after the census date, are added to their respective SLAs. (All persons arriving in Australia, including Australian residents returning, on passenger cards are required to report their intended address which is taken to be the usual residence.) If the census does not occur on 30 June (for example the 1996 Census was held on 6 August) then a further adjustment is made to produce estimates at the nearest 30 June reference date.
3.15. These adjustments take into account any change in the population of each SLA (due to natural increase and net migration between 1 July and 6 August) from the 6 August population estimate. For births and deaths, the actual events registered as occurring between these dates are taken into account. Net migration is estimated based on the relevant proportion of the population who moved within the previous 12 months as recorded in the 1996 Census. Inter-SLA migration is constrained to net interstate migration levels while overseas arrivals was similarly constrained, using overseas migration data. As the Census does not collect data on overseas departures, SLAs are assumed to have the same proportion of State overseas departures as they had of arrivals.
3.16. Finally, the SLA population estimates are constrained to sum to respective State 30 June estimates.