Some things I learned:
In 2007 there were 302 million U.S. residents, up from 281 million in 2000 and 227 million in 1980.
Between 1991 and 2007, the percentage of high school students who reported attempting suicide ranged between 7% and 9%, and the percentage who reported a suicide attempt that required medical attention ranged between 2% and 3%.
In 2005–2006, 30% of adults often or almost always had trouble sleeping in the past month.
In 2007, 8% of people 12 years of age and over reported use of any illicit drugs in the past month.