and what vocabulary size is proposed for a non-native Finnish speaker?
I would be also very grateful for the official source.
What is the average vocabulary size of native Finnish speaker?
Re: What is the average vocabulary size of native Finnish speaker?
Yhden ihmisen sanavaraston laajuudeksi on arvioitu 30 000–40 000 sanaa.
https://fi.wikipedia.org/wiki/Suomen_kielen_sanasto
https://fi.wikipedia.org/wiki/Suomen_kielen_sanasto