Declining Number Who Smoke. Daily use of cigarettes by U.S. 12th graders is declining. In 1995, 21.7% of 12th graders smoked daily. This number decreased to 5.9% in 2008 (Source: Monitoring the Future, University of Michigan Institute for Social Research and National Institute on Drug Abuse). Find the average rate of change in the percent of 12th graders who smoke from 1995 to 2008.
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