From the Economist:
In the 15 years since its birth on January 1st 1995, 401 trade disputes—over matters ranging from export curbs on minerals to restrictions on the import of seal products—have been brought to the World Trade Organisation’s dispute settlement body (DSB). The bulk of cases have been brought by a few litigious WTO members. America and the European Union have lodged 176 cases since the WTO came into being, and are also the most frequently complained against. Rich countries were the heaviest users of the DSB in the first five years of its existence, filing more than three-quarters of all complaints. But in the ten years since, that share has fallen to just over half, as big emerging economies have become active trade litigators.