Latest study in Spain around 1-1.3. 70,000 participants.

https://english.elpais.com/society/2020-05-14/antibody-study...

Most studies in Europe show this: 0,5 - 1.

NYC and Stockholm antibody tests would indicate an IFR more like 1% or a little over.

Though I'd be cautious about being too confident in antibody study results, for now. A lot can depend on test accuracy (especially where covid is rare anyway).

That study (and the related Santa Clara study by a subset of the same authors) were torn apart by statisticians for the shoddy methodology and irresponsible selling of its results to the media.