South Africa: Airmail labels

Here are some newer airmail labels from South Africa. At first all labels look similar but all of them are different. The main design is the same only some minor changes done to each label.

Year: ?, Self-adhesive. This one for me looks the current design label. Round corners,
Tagline: By Airmail / Priority

Year: ?, Self-adhesive. Square corners, Tagline: By Airmail / Per Lugpos / Par Avion

Year: ?, Tagline: Per Lugpos / By Airmail / Par Avion

Year: ?, Square corners, dark violet/blue color. Tagline:  By Airmail / Per Lugpos / Par Avion

Year: ?, Square corners, a bit smaller the other labels. Tagline:  By Airmail / Per Lugpos / Par Avion

Year: ?, this a pane of  7 labels.