I came across this grafic recently showing the locations of close passing harassment. I've no certainty how valid it may be as areas of greater population density will show a higher occurrence of such incidents. However, despite the likelihood of skewed results, it may be better than merely sitting on our hands.
https://closecalldatabase.com/
When I zoom in on my local riding area in and around Bristol/Providence, Rhode Island to about 40 miles in any direction, there is a large region of minimal incidents but 60 miles north in the Boston area, there are many incidents. So far this follows local perceptions that Boston motorists have a 'certain' reputation.