Apparently, Oberon never had considerable amount of community interest, even compared to Modula-2.
There are even not enough results to show which regions were most interested in Oberon. Interesting, that interest by Modula-2 was even higher in Spain, than in Germany.
What is also interesting, Oberon never was as popular as today.
Not even when there were much more development for Oberon S3 or V4, than today with new Project Oberon.
Probably, this is because recently more people are interested in programming languages than before, and new PO was published in time, when programming languages have favorable conditions.