Until 2020, the quotient and entitlement of each territory was obtained using a similar rounding method to the one used for the states. In 2003, a statistical error margin — equal to twice the standard error of the population estimate — was added to the quotient for each territory. This margin was provided by the Australian Bureau of Statistics. The quotient and the error margin were added and rounded off to the nearest whole number to determine the entitlement for each territory. These provisions enabled the Northern Territory to retain its second seat at the 2004 federal election, and the Australian Capital Territory to gain a third seat at the 2019 federal election.