Estimated Number and Prevalence of People Who Inject Drugs
"The joint UNODC/World Health Organization (WHO)/Joint United Nations Programme on HIV/AIDS (UNAIDS)/World Bank estimate for the number of people worldwide who injected drugs in 2015 is 11.8 million (range: 8.6 to 17.4 million), corresponding to 0.25 per cent (range: 0.18 to 0.36 per cent) of the population aged 15-64 years. This estimate is based on the reporting of injecting drug use from 107 countries, covering 89 per cent of the global population aged 15-64 years.
"Subregions where the prevalence of injecting drug use is above the global average are Eastern and South-Eastern Europe, Central Asia and Transcaucasia, North America, Oceania and South-West Asia. More than half (53 per cent) of PWID worldwide reside in just four countries (China, Pakistan, Russian Federation and United States)."
United Nations Office on Drugs and Crime, World Drug Report 2017 (ISBN: 978-92-1-148291-1, eISBN: 978-92-1-060623-3, United Nations publication, Sales No. E.17.XI.6). Booklet Two: Global Overview of Drug Demand and Supply: Latest trends, cross-cutting issues, p. 19.