PPT Slide
Percentage of 10th-Graders Who Have Used Marijuana: : Monitoring the Future Study, 1999 9
1991 1992 1993 1994 1995 1996 1997 1998 1999
A 23.4% 21.4% 24.4% 30.4% 34.1% 39.8% 42.3% 39.6% 40.9%
B 16.5 15.2 19.2 25.2 28.7 33.6 34.8 31.1 32.1
C 8.7 8.1 10.9 15.8 17.2 20.4 20.5 18.7 19.4
D 0.8 0.8 1.0 2.2 2.8 3.5 3.7 3.6 3.8
D= Daily use in past month