About Average is 30-70 pounds.
This information can be found at the Government Census and Statistics site under their respective categories both online and offline at the library or business development office.
About $34.3 million (as of 2006 and this was a reduction down from about $113.4 million). Check this out: http://www.fas.org/sgp/crs/misc/RS22771.pdf
They pay 22% of 4.19 billion dollars. You do the math.
too much. 9.29 million $'s worth. over 900 million pieces each year.