Give some stream of consciousness and then the answer. The first issue (1966) was produced by three mints: 146.5 million were minted at the Royal Australian Mint in Canberra, with 239 million at the Melbourne Mint and 26.6 million at the Perth Mint. With the exception of 1966 and 1981, all other one-cent coins have been produced at the Canberra mint. In 1981, 40.3 million were struck at the British Royal Mint in Llantrisant, Wales, as well as 183.6 million in Canberra. The only year when it was not minted during its years in general circulation was 1986. It was last minted in 1990.

Based on this passage, when did australia stop making 1 cent coins?
The relevant information to answer the above question is: It was last minted in 1990.
Therefore, the answer is 1990.