Coming into year 7 I went to school with a bad atmosphere and some really bad people it. Management also had some idea that they'd break up all the prior groups, so I got placed with only one guy that wasn't really a close friend for classes. For the first year it wasn't very personal. Senior students would loudly mock me, and a lot of non-aggressive pupils, usually for some thing to do with personal style or alleged sexual perversion, in front their peers, sometimes someone would sweep my leg, or break stuff, mostly like expensive mechanical pens or textbooks/notebooks. The younger jackasses in my cohort would do things like light spray deodorant on fire and use it as a flamethrower and sweep laser pointers against peoples eyes (and at the time it was still rumored that can give permanent eye injuries). Year 8 I had dirty pond water thrown at me and a classmate by a group of bullies blocking a path. They scattered and ran when I started towards them, but after that it was personal. I guess rumors travel quickly in those circles and I had about a year and a half of personal hell as they marked me (always in groups, the fucking cowards) in recess and lessons with weak teachers. First followup I got soaked through with water the assailant said she'd taken out of the toilet. Not too long after two guys cornered me with a clear aim at breaking my musical instrument and beating me up. They didn't succeed, I evaded, but the ringleader was known to have beaten a guys face bloody against a brick wall, so the threat wasn't idle. In practice the physical violence was limited to getting pushed roughly into lockers and getting hit i the back of my head once when one of them managed to catch me unaware. They broke my vehicles twice, one of them in a way I'm just lucky didn't kill me in a traffic accident. But the constant threat of much worse violence and their ever-present jeering about my alleged sexual deviances, mocking my dialect, calling me crazy, and so on, that really took its toll. I had days when I couldn't hold any food. I'd just throw up frow the stress. As for the crazy, they were just being assholes then, I was simply a sensitive kid with too much belief in pacifism and going through the system. But that one they kind of managed to make come true. I have struggled for decades now with depressions and a sense of hopelessness. I can't connect with friend groups, I've been in to shitty shape to get a partner and I am fighting the suicide impulses less and less for my sake and more for the effects on my relatives. And I won't say the bullying alone did that, but it was an indispensable beginning for it.

For your statistics, this was Sweden.