This is both factually incorrect and fundamentally misleading. Using the IMF's World Economic Outlook DB from the April 2018 I compiled this list of the top 50 countries by GDP Growth (PPP) for 2017 and each country's trade relationship with the EU.
Five are EU Members ...
They are Ireland, Romania, Malta, Slovenia and Estonia (Poland is in 51st position). Of the remaining 45, 19 are on the EU's Everything But Arms deal for Developing Countries meaning tariff-free exports for everything but guns. 10 are on the EU's GSP or GSP+ schemes.
GSP/GSP+ & EBA are unilateral tariff free-quota free and tariff reduction schemes for developing countries.
It should be noted that it is these relatively low-developed countries that tend to have higher growth rates and the actual volume in them of trade is relatively low.
Of the 16 remaining countries, 10 have Bilateral/Multilateral FTAs with the EU. Libya has no functioning Government, Macao is a special administrative region of China leaving only 4, China, Turkmenistan, Malaysia and the Maldives trading on WTO terms
ec.europa.eu/trade/policy/c…