FBI announces lower recovery rate of stolen vehicles (43.2% recovery rate)
 

As taken from http://reviews.cnet.com/8301-13746_7-20016416-48.html

It has a plug for lojack but lojack is only covered in less than half of all USA states.

Newer vehicles are harder to steal thus amateur thieves (to be used for other crimes, joyriding or a simple ride to a drug house) is down but professional thieves (those who copy your keys, steal your keys from your house or at worst carjack you) remains constant.