Comment by lrasinen

The Finnish public broadcaster has used a model to predict final vote share for as long as I remember. The stated purpose is to offset the bias that comes from smaller, more rural municipalities reporting sooner.

It usually kicks in when 10-20 % of the votes have been counted and switches back to raw results near the 90% mark.

Didn't find an exact date when they started using it; an article says "dates back to 1960s" but it's definitely been a staple in 2000s.