Structured item; used here for the dated office and honour statements (Treasurer of Queensland, KCMG award date) that the Wikipedia prose does not date precisely.
For “Treasurer of Queensland” FROM 19 AUG 1983 TO 1 DEC 1987 of Johannes Bjelke-Petersen
position held: Treasurer of Queensland ("19 August 1983" to "1 December 1987")
Wikidata carries this dated office statement; the Wikipedia prose does not name him as Treasurer, so this event rests on Wikidata alone and is flagged accordingly.
For “Title (KCMG)” 23 JUN 1984 of Johannes Bjelke-Petersen
award received: "Knight Commander of the Order of St Michael and St George" (awarded "23 June 1984")
Supplies the exact award date of 23 June 1984, which the Wikipedia prose gives only as the year 1984.