‘Racketeering activity’ means engaging in at least two crimes related to racketeering that have the same or similar pattern, intents, results, accomplices, victims or methods of commission, or are otherwise interrelated by distinguishing characteristics and are not isolated incidents, if at least one of the incidents occurred after July 1, 1983, and the last of the incidents occurred within 5 years after a prior commission of a crime related to racketeering.