Well, essentially "Southwest of Africa" is misleading because we know this location better as "Bouvet Islands". Generally the occurrence of bigger quakes was around 50%.

One particular thing could be observed. Kamchatka did happen more than usual. If we compare to what has happened in Komandorskiye Ostrova we could easily be looking for 7+ there pretty soon. In any case Komandorskiye is acting peculiar.

In 2013 Kamchatka produced days of foreshocks which culminated in a 8.3 in Sea of Okhotsk.

1969-10-26 6.3 South of Africa
1969-10-31 6.6 Aleutian Islands
1969-11-01 6.6 Gulf of California

1971-12-07 6.2 Bouvet Island region
1971-12-15 7.6 Kamchatka

1975-03-30 6.3 Bouvet Island region
1975-04-06 6.2 x 2 at Kamchatka

1996-06-21 6.7 Kamchatka
1996-06-22 6.4 Bouvet Island region, later 6.2 Kamchatka

2014-04-15 6.8 Bouvet Island region
2014-04-18 7.2 Mexico
2014-04-19 7.5 PNG

2015-10-23 6.2 Bouvet Island regoin
2015-10-26 7.5 Afghanistan

-Finland