From 2005 to 2016 Chicago with a population of 2.7 million had between 3 and 8 cycles deaths per year vs 27 to 65 pedestrian deaths and 282 to 487 motorists. https://activetrans.org/sites/files/crash%20report%202018%20... Edit: The closest to 1/3 days I could find was 13 bicycle deaths and 95 pedestrian fatalities totaling to 108 for the region. Which is 1 cyclist death per 28 days out of ~10 million people.