For what it’s worth, at my high school the incidence of (recurrent and/or obvious) cheating was closer to 50%, and even then the majority of the cheating was on homework, where some of it may not technically have been cheating at all.
This may have been due to an unusually high probability of getting caught (private school, small classes, and engaged teachers) and unusually strong punishments, up to and including expulsion.
For what it’s worth, at my high school the incidence of (recurrent and/or obvious) cheating was closer to 50%, and even then the majority of the cheating was on homework, where some of it may not technically have been cheating at all.
This may have been due to an unusually high probability of getting caught (private school, small classes, and engaged teachers) and unusually strong punishments, up to and including expulsion.