This sudden increase appears in large part due to imports from China, Thailand, and Japan, which have been under investigation by the US and are currently subject to US anti-dumping measures.
Sellise ootamatu suurenemise põhjuseks on suures osas Hiinast, Taist ja Jaapanist pärit import, mida on uuritud USAs ja mille suhtes kohaldatakse seal praegu dumpinguvastaseid meetmeid.