Please note that one descriptor may be attached to multiple subject categories in different sub-thesauri. The deletion of a descriptor in one sub-thesaurus therefore does not necessarily mean that this descriptor has been totally eradicated from the thesaurus. Similar to the vocabulary itself, the category system of the thesaurus has changed as well along the different version changes of the thesaurus. The numbers are computed according to the latest version of the thesaurus category system.