About:
This site uses real time queries of Arne's fantastic ClickHouse db which means the numbers are always current.
Balloon telemetry is excluded from the calculations but suspected bad decodes are not.
WSRP Challenge and Jim Lills List both remove lone spots that are only reported by one station as probable bad decodes.
That's a good option for HF but not so good for VHF/UHF sporadic E!
But it's too hard to implement using live db queries so these numbers may be a tiny bit higher depending on the bad decode percentage.