Report - TABLE 1 Trends in Lifetime Prevalence of Use of …ns.umich.edu/Releases/2007/Dec07/mtf/drug_tables.pdf12th Grade 15.4 13.9 15.1 15.7 15.3 15.3 16.5 16.4 16.3 15.6 16.2 16.8 14.4 15.0

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