Monitoring the Future national survey results on drug use, 1975-2009.
A national survey gave a rate of 7.2% in 2004.
A national survey has shown one in 15 schools can expect some sort of fire.
The association says its own national survey found that the cost of an average business dinner is $19.58.
In some cases, information is not available on a particular subject for all the national surveys.
But the national survey also showed that you don't have to move much to hurt your back.
Two men show up pretending to be working on a national survey of the average American family.
The findings were based on a national survey of 8,098 people.
The government gets its data from a national survey conducted every five years.
In a recent national survey, 43 percent of those asked to rate his performance gave him a perfect 10.