Consumer price index (CPI) rates are published by the Australian Bureau of Statistics (ABS). The ATO has reproduced the rates on its website as these are relevant to some provisions in tax and superannuation law.
Note that the ABS changed the index reference base in September 2012 from 1989-90 to 2011-12. As a result, all CPI rates have been reset and the previous rates no longer apply.
For a copy of the changed rates, go here