https://www.nytimes.com/1994/10/23/us/historical-study-of-ho...
> New data presented at the conference by a Dutch scholar, Pieter Spierenburg, showed that the homicide rate in Amsterdam, for example, dropped from 47 per 100,000 people in the mid-15th century to 1 to 1.5 per 100,000 in the early 19th century.
> Professor Stone has estimated that the homicide rate in medieval England was on average 10 times that of 20th century England. A study of the university town of Oxford in the 1340's showed an extraordinarily high annual rate of about 110 per 100,000 people. Studies of London in the first half of the 14th century determined a homicide rate of 36 to 52 per 100,000 people per year.
You can thank your local police department, among other institutions, for that dramatic decline in crime rates.