While tariff barriers have decreased worldwide through various GATT rounds, anti-dumping has surged to play a crucial role as the most important non-tariff barrier. After much debate and opposition, anti-dumping is on the agenda of the Doha round of multilateral trade negotiations and it is one of the most important issues, especially for developing countries as they are the main targets of this policy instrument. With this prospect, it is important to assess the relevance of anti-dumping not only by focusing on traditional users but by analysing the experience of new users, which are now major players in the field. This paper improves upon existing studies by providing a comprehensive assessment on the use of anti-dumping. First, data on the time pattern of worldwide implementations of anti-dumping laws are presented. This time profile shows interesting relationships with legal developments in GATT and WTO dispositions. Second, usual sources of data are complemented with various other sources. This allows the inclusion of recent heavy users like China, Russia, Taiwan and Ukraine, which are ignored in similar studies but important for their trade volumes. This enlarged and updated dataset shows that new users are even more important than previously thought, with implications for the Doha negotiations.