It's not obvious at all. exactly two trading partners with seasonal improvements in exports and constantly growing economies could have this sort of export data

It's not obvious at all. exactly two trading partners with seasonal improvements in exports and constantly growing economies could have this sort of export data: http://www.wolframalpha.com/input/?i=x%2B+sin+x%2C+x%2Bcos+x http://www.wolframalpha.com/input/?i=x%2B+sin+x%2C+x%2Bcos+x just cherry pick your reporting dates, everyone is a net exporter.