According to data from the Swedish Public Health Authority, ~40% of the population had covid antibodies in mid-January 2021. Source: https://sebastianrushworth.com/2021/01/25/heres-a-graph-they-dont-want-you-to-see/
Using this estimate of the infected population and combining with the deaths per million of ~1000 as at mid January (source), Sweden plots on the death table as shown below and with an estimated average infection fatality ratio between 0.2% and 0.3%. This infection fatality ratio is lower than the CDC 9/10/20 estimate of~0.7%. On balance, the Swedish data is probably closer the reality (see the Sebastian Rushworth post for commentary). I will be publishing some of the data I’ve been looking at on IFR in due course.
Note: there is some great data on Sweden, along with comparisons to other countries, at the link below. The website is in Swedish – but it’s pretty easy to figure it out.