“Trade and Tariffs: Trade grows as tariffs decline” written by WTO is published in 2015.
Global trade in goods has been boosted by the reduction in import tariffs over the past 20 years. Even when countries have negotiated high ceilings for their tariffs on joining the WTO, they have consistently reduced the tariffs they have actually applied to their imports since becoming a WTO member. In addition, sectoral agreements such as the Information Technology Agreement have further boosted trade by obliging its participants to completely eradicate tariffs on products covered by the Agreement and to offer the same concessions to all other WTO members. This has helped to further open up trade and to lead to trade growth.
This publication could be downloaded here