"Among people who did use pain‑killers and opioids for non‑medical purposes, those who used them at least weekly declined from 29% in 2016 to 19.5% in 2019, while the proportion who used them only once or twice a year increased from 28% to 43% (Table 5.10).

"Despite this reduction, many people still struggled to cut down on their non‑medical use of pain‑killers and opioids. Of all people who had used them in the previous 12 months, 31% said they could not cut down on their non‑medical use, even though they had wanted to or attempted to stop (Table 4.35a)."

Source

Australian Institute of Health and Welfare 2020. National Drug Strategy Household Survey 2019. Drug Statistics series no. 32. PHE 270. Canberra AIHW.