The dividends are fully franked. These franking credits are included as part of the advertised coupon rate, so the cash received is less than that.
If you bother to go through the maths, here's an example for the Sep 2019 distribution.
BBSW @ 20190617 (prev payment date): 1.30%
Days in period: 92
Company tax rate: 30%
$0.8293 = $100 * (0.013 + 0.034) * (1 - 0.3) * 92 / 365
