"Figure 4: There has been an increase in the number of potential victims of all exploitation types since the year ending December 2016","" "Number of potential victims of modern slavery reported under the duty to notify, by exploitation type, England and Wales, year ending December 2016 to year ending December 2018","" "","" "Notes","1. Data from duty to notify systems are not designated as National Statistics. 2. Data were extracted from the system on 18 November 2019. 3. Following corrections, the duty to notify data presented here do not align with the [2019 UK Annual Report on Modern Slavery](https://www.gov.uk/government/publications/2019-uk-annual-report-on-modern-slavery). " "Unit","Number of potential victims" "","" "","Labour exploitation","Sexual exploitation","Criminal exploitation","Domestic servitude","Multiple exploitation","Unknown exploitation","Other or not recorded" "Dec-16","237","213","21","38","177","73","1" "Dec-17","596","411","46","75","362","94","53" "Dec-18","644","357","70","83","353","138","43"