(1) The index number for a quarter is the All Groups Consumer Price Index number, being the weighted average of the 8 capital cities, published by the Australian Statistician in respect of that quarter.
(2) Subject to subsection (3), if, at any time before or after the commencement of this Act:
(a) the Australian Statistician has published or publishes an index number in respect of a quarter; and
(b) that index number is in substitution for an index number previously published by the Australian Statistician in respect of that quarter;
disregard the publication of the later index number for the purposes of this section.
(3) If, at any time, the Australian Statistician has changed or changes the index reference period for the Consumer Price Index, then, in applying this section after the change took place or takes place, have regard only to index numbers published in terms of the new index reference period .
(4) In this section:
"Australian Statistician " means the Australian Statistician referred to in subsection 5(2) of the Australian Bureau of Statistics Act 1975 .