I would suggest contacting the NBDA for a crude number, perhaps US customs too.  However most states don't even know their economic impact, let alone a worldwide total of all those unknowns.

On Friday, April 20, 2012, James R. Weber wrote:
Neil,
Are you looking for a broad sweep or specifically bikes components
government taxes import export duty etc???
James Weber
Olympia Wa
360-894-0908 this has voice spam so say Clyde
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The mission of the Bicycle Collective is to promote cycling as an effective and sustainable form of transportation and as a cornerstone of a cleaner, healthier, and safer society. The Collective provides refurbished bicycles and educational programs to the community, focusing on children and lower income households.