There are reasons to be extraordinarily careful with these kinds of statistics - for example in germany the statistics are based on when the crime is reported,

There are reasons to be extraordinarily careful with these kinds of statistics - for example in germany the statistics are based on when the crime is reported, not when it occurred. We had one spike in germany between 2016-2018 when hundreds of potential cases attributed to a single serial killer entered the statistics. Most of these cases had been committed a decade earlier.