[dns-operations] Recent domain counts for DS algorithms 5, 7, 8 and 13

[Viktor Dukhovni]

See attached graph for past ~18 months of domain counts with
at least one DS RR for each of algorithms 5, 7, 8 and 13.

It is too soon to expect a noticeable decline in the numbers
for the SHA-1 algorithms (5 and 7), but I hope that at least
the operators on this list still using RSASHA1 (5 and 7) are
making algorithm rollover plans.  I'll post an updated graph
in ~2 to 3 months.

-- 
	Viktor.

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