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Monitoring the Future -- Trends in Any Illicit Use
HS Senior Class Cohorts of 1995 through 2008



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Any Illicit Use Within Cohort -- High School Senior Classes of 1995 through 2008
Lifetime Past Year Past Month

Source: Monitoring the Future, 2009, Tables 5-5a, 5-5b and 5-5c, pp.202-13

Trends in Use of Any Illicit Drug Within HS Senior Cohorts -- Classes of 1995 through 2008
  Lifetime Past Year Past Month
Class of: 8th Grade 10th Grade 12th Grade 8th Grade 10th Grade 12th Grade 8th Grade 10th Grade 12th Grade
1995 18.7 32.8 48.4 11.3 24.7 39.0 5.7 14.0 23.8
1996 20.6 37.4 50.8 12.9 30.0 40.2 6.8 18.5 24.6
1997 22.5 40.9 54.3 15.1 33.3 42.4 8.4 20.2 26.2
1998 25.7 45.4 54.1 18.5 37.5 41.4 10.9 23.2 25.6
1999 28.5 47.3 54.7 21.4 38.5 42.1 12.4 23.0 25.9
2000 31.2 44.9 54.0 23.6 35.0 40.9 14.6 21.5 24.9
2001 29.4 46.2 53.9 22.1 35.9 41.4 12.9 22.1 25.7
2002 29.0 45.6 53.0 21.0 36.4 41.0 12.1 22.5 25.4
2003 28.3 45.6 51.1 20.5 37.2 39.3 12.2 22.7 24.1
2004 26.8 44.6 51.1 19.5 34.8 38.8 11.9 20.8 23.4
2005 26.8 41.4 50.4 19.5 32.0 38.4 11.7 19.5 23.1
2006 24.5 39.8 48.2 17.7 31.1 36.5 10.4 18.3 21.5
2007 22.8 38.2 46.8 16.1 29.8 35.9 9.7 17.3 21.9
2008 21.5 36.1 47.4 15.2 28.7 36.6 8.4 16.8 22.3

Note: Data has been adjusted chronologically to reflect changes in drug use patterns within each senior class cohort. That is, the 10th grade and 8th grade data are taken from the corresponding 2 years and 4 years prior respectively to the year shown, for each cohort class.


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