Here is some links the tariff data is in the second link
if you have not seen this data it is an eye opener in that there is no FREE TRADE FOR AMERICAN GOODS.- other links show that with inflation all the hoopla about free trade incr our GDP is very overblown.
http://dataweb.usitc.gov/
http://www.ita.doc.gov/td/tic/tariff/country_tariff_info.htm
http://www1.jsc.nasa.gov/bu2/inflateGDP.html
Good links.
Unfortunately, if a $345B trade deficit isn't enough for "free traders" to reconsider their position, I doubt 20% vs. 1.6% tariffs will.