From some Motley Fools:

According to a Gallup poll of full-time workers conducted between 2010 and 2012, of the roughly 100 million in the labor force, only 30 million are considered engaged with their job. The remaining 70% are considered “not engaged,” or apathetic, toward their job, while 18%, or 18 million, full-time employees are actively disengaged from their employer and potentially looking to undermine their company. These disengaged workers are responsible for costing U.S. businesses upward of half a trillion dollars each year.