Many thanks to SWLing Post contributor, Mark (VA3MK), who writes:

I found a great website written by the former head of broadcasting in Finland.

I hope this brings back memories of YLE Radio Finland.

I used to listen regularly on 15.400 MHz when they were on the air. Enjoy:

http://www.ulkomaanmedia.net/RFTIMELINE.html

What a fabulous deep dive into YLE Radio Finland history! Thanks for sharing, Mark.