Most data are drawn from national censuses or surveys based on self-declaration, not from direct testing of literacy competence(see also paras. 28-34 below).
However, a comparative analysis of the abuse of“ecstasy” by youth worldwide is difficult because most data come from Europe, North America and Australia.
Most of the data is unstructured and therefore, you need an efficient method to extract mandatory information and transform it in usable or understandable format.
The most recent yearbook, published in 2006, covers the period 2000-2004; it was made possible through the cooperation of Governments, which supply most of the data in the form of replies to standardized questionnaires.
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