This post extends a prior post from last year to cover the period until the end of 2021. Note that the plots below do not show the number of posts, nor the number of stations posted, on the RBN. Rather, the algorithm for generating the plots is described here. Twelve equally-separated points are plotted for each year.
As before, this allows one to see the peaks corresponding to the annual CQ WW and ARRL DX contests, as well as the annual cycles of activity on the different bands as propagation changes through the year, in addition to the overall sunspot cycle. Despite the various comments I read about CW activity declining, the data seem to show no evidence of any actual decrease.
We can filter the data by continent:
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