The Harmonized System was introduced in 1988 and has been adopted by most of the countries worldwide. It has undergone several changes in the classification of products. These changes are called revisions and entered into force in 1996, 2002, 2007, 2012 and 2017. Detailed amendments to each HS nomenclature are available at attachment links below.
Information on Harmonized Commodity Description and Coding Systems (HS) can be found at the World Customs Organization website at: http://www.wcoomd.org/home_wco_topics_hsoverviewboxes.htm.