You may find this article of interest, written by Clublog Author Michael G7VJR?
”A question that comes up in the context of DXpeditions is just how many uniques are there out there? We’re aware that there are at least 50,000 (a record set by T32C in 2011) but can we estimate the full size of the population?
I ran a short database analysis against Club Log’s records for QSOs made after 1 January 2012. How many unique callsigns are worked in each continent?…..”
Read the full article by visiting Michaels website (click here).