Here's a related fun fact.
On 1 February 2005, the "Duty Free Allowance" was set at $900 per person.
Most people use the allowance to purchase alcohol, specifically spirits, as Australia has one of the highest rates of alcohol tax in the world.
On 1 February 2005, the Australian excise tax on spirits was $60.92 per litre of alcohol. Today, it is $101.85.
If the $900 allowance was indexed at the same rate as the taxes, the $900 allowance would be $1,500 today.
For context, compared to Australia's AU$101.85 per litre of alcohol, The US Federal excise + Texas levies AU$12.91 and 15 US States have only the Federal excise of AU$10.41.