"Go to NIDA's web site. While your there please learn something please and stop making me do your homework."
Just for you I went to NIDA's website and looked around and finally got linked to a DEA web page where they cite NIDA's numbers. You will not that in 2001 the average commercial grade marijuana was 4.72% THC and the average sinsemilla was 9.03% THC. It looks like the ONDCP rounded up on the commercial grade and down on the sinsemilla. The DEA web page doesn't say what the average of all marijuana seized in the U.S. was in 2001, but the ONDCP link I provided you said the avaerage of all types seized was 5.02%. Mostly what is out on the streets is the cheap commercial stuff. Most people can't afford to buy the expensive "connesuoir" varieties which while they may be more potent, are much more expensive and not as widely available throughout the states.
One other thing you will note from the DEA link is that the Marijuana Potency Monitoring Project is conducted by the University of Mississippi, and sponsored by NIDA. If you ever do any research on this issue, you will see that if our government provides sources for data on marijuana potency in the U.S., they'll always cite the Marijuana Potency Monitoring Project.
Here's the link: http://www.usdoj.gov/dea/pubs/intel/02058/02058.html#6