Lynchings were never commonplace. There were 3446 recorded lynchings of blacks in 1882-1968 [1]. That is 40 per year. We don't know how many were not recorded, but lets say only 1 in 5 was, for a total of 200 per year. That's thirteen times less than the 2018 black-on-black homicide rate, and less than half of the black-on-white homicide rate [2].

[1] https://www.naacp.org/history-of-lynchings/

[2] https://ucr.fbi.gov/crime-in-the-u.s/2018/crime-in-the-u.s.-...