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In 1998 there were just over 20,000,000. This site, http://www.nhtsa.dot.gov/PEOPLE/injury/research/TrendAnalysis/2_chip.htm will give you statistics relevant to growth and % of population with projected growth to 2010.

That was the latest information I could find in a quick search.

2007-07-19 16:29:11 · answer #1 · answered by Caretaker 7 · 0 0

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