Compare it to its American counterpart, PCUSA.
There, 21% of the churches have 25 or fewer members.
over 32% of the members are 75 years old or older.
Membership in 2022 was 1,140,665. In 2008 it was 2,313,662. So they lost over half their members in 14 years.
Sources:
https://www.pcusa.org/site_media/media/uploads/oga/pdf/2008-comp-sum.pdf
https://pcusa.org/site_media/media/uploads/oga/pdf/statistics/2022_stats_comparativesummaries.pdf
Lost? or passed?!?