http://www.unodc.org/pdf/WDR_2006/wdr2006_volume2.pdf

It provides one of the most comprehensive overviews of illicit drug trends at the international level. In addition, it presents a special thematic chapter on cannabis, by far the most widely produced, trafficked and used drug in the world. The analysis of trends, some going back 10 years or more, is presented in Statistic. Document in PDF format, required Acrobat Reader.