Prevalence of Narcissism

How common is Narcissism in the United States? Based on news reports that stretch from Politics to Hollywood, is it increasing?

Estimates suggest 0.5 to 1.0 percent of the general population meet the criteria for Narcissistic Personality Disorder in the United States. It has been identified in 6.0 percent of the forensic population, 20 percent of the military population, and 17 percent of first-year medical students. About 2.0 to 16.0 percent of those seeking help from a mental health professional will receive a narcissistic personality disorder diagnosis. There is some sense that Personality disorders may be increasing. However, whether that is due to more sophisticated diagnosis abilities, a reflection of current culture and mass social media, or actual increases is as yet of unknown.