sir johannes bjelke-petersen kcmg, page-6

I seem to have a discrepancy regarding your 19% claim.

“1986: After a controversial electoral redistribution in which Sir Joh refined the electoral gerrymander left by Labor, the Nationals won government with just 38.6 per cent of the vote.”
And this is from the ABC.

Considering they regularly made the Gerrymander claim against Queensland but conveniently ignored any other I see no reason to disbelieve the 38.6%