UNODC surveys governments on trafficking victims identified in their respective countries for the Global Report on Human Trafficking, using a common questionnaire with a standard set of indicators, and then aggregates the results.
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Data are largely published in the form of total numbers disaggregated by variables such as sex, age, and type of exploitation, wherever possible. In addition to government surveys, UNODC collects official information such as police reports that are available in the public domain, and some information from inter-governmental organisations and NGOs. While these data are not detailed, they have the widest geographical coverage and therefore provide useful baseline information on human trafficking at the global level. Furthermore, in the absence of publicly available disaggregated data, official reports may be the only source of data on identified victims available in a given country or region.