Does the southern dominance of solar activity really exist in solar cycle 21?

In this paper, 20 solar-activity phenomena are collected to investigate solar activity in solar cycle 21. The results obtained show that we can hardly say that either the south dominance of solar activity or the north dominance exists for solar cycle 21. It is also inferred in this paper that solar activity in solar cycle 21 has a northern bias at first, then as the cycle progresses, southern predominance takes over and tries to balance solar activity in the northern hemisphere. Solar activities in the southern and northern hemispheres are not necessarily in phase.