Technology and the Environment

1. I am investigating the environmental impact of Zero Skateboard Co.

2. So far i have looked at these websites:
http://zeroskateboards.com/products/sp11/index.html
http://en.wikipedia.org/wiki/Skateboard
http://en.wikipedia.org/wiki/Zero_Skateboards

3. So far I have answered these questions:
A, C, D, E, F, D, H, I, J, and K.

4. So far I am having trouble answeringthis question:
"How many skateboards are manufactured each year?"

5. My plan to find the remaining information is to look for a book in my house that I know has the number of skateboards made each year.