A bearish market for opium production after Talibans enforced new regulations early 2001[1], and a correction after those were disputed by the USA late 2001, from the United Nations Office on Drugs and Crime,
https://www.unodc.org/documents/crop-monitoring/Afghanistan/Afghan-opium-survey-2014.pdf
Synapses
Taliban's Ban On Poppy A Success, U.S. Aides Say - New York Times (May, 2001)
World's opium source destroyed - The Guardian (May, 2001)