Here's a paper that attempts to do it right: Castro, A., S. Kahlmeier and T. Gotschi (2018), “Exposure-adjusted Road Fatality Rates for Cycling and Walking in European Countries”, Discussion Paper, International Transport Forum, Paris.

https://www.itf-oecd.org/sites/default/files/docs/exposure-a...

Germany does rather well. Though the paper is 6 years old (and based on numbers even older) and the number of bike accidents in Germany have gone up since then.