The US and Canada are are a MONUMETAL trade deficit with China. I dont know specifics but it is sorta like 400 : 1
more importantly, what is exported to China is primarly natural resource or raw materials that are eventually converted into goods that are sold here.
for more specific details view here: http://www.pbs.org/wgbh/pages/frontline/shows/walmart/
the reason is that Chinese incomes do not support the purchase of Western produced goods.
Ie. you can buy chinese made cars in China for $2500 CDN… why the hell would you want a Pontiac Pursuit for $23k?.. it doesnt happen.