Den mest åbne økonomiske enhed i forholdet til tredjelande i 1989 var Den Belgisk-Luxembourgske Økonomiske Uni­on, hvor importen svarede til 19,2% af de to landes BNP, medens tallet for eksporten var 16%.
The most open economy with regard to third countries was in 1989 the Belgium-Luxembourg Economic Union where imports were equivalent to 19,2 % of the GDP of these countries and exports equivalent to 16 %.