Crime Rates
Okay, for all those people not paying attention to reality: the crime rate is, was, and, for the foreseeable future, will be directly related to the number of males between 15 and 45 in the population. It went up with the rise of the Baby Boom, and has been in decline since the Boomers hit 46 in 1992.
Nothing else comes close to this direct relationship, and it has been known and written about in criminal justice literature for decades.
