According to the website, Statista, U.S. merchandise exports in 2015 amounted to just over $1.5 trillion. (https://www.statista.com/topics/1715/us-export/). As the U.S. GDP in 2015 stood at roughly $18 trillion, exports comprised less than 10 percent of GDP. Canada was the top-ranked U.S. export market,  and exports to Canada more than doubled exports to third-ranked China.