The latest survey of Avon students in grades six through 12 showed a decline in alcohol and marijuana use. The survey was taken this past April and the results released this fall, along with a comparison with previous surveys. Among the findings was a sharp drop in the percentage of ninth- through 12th-graders who reported using alcohol within the last 30 days — from 42 percent in 2011 to 26 percent. The percentage of students who said they used marijuana in the last 30 days fell from 32 percent to 24 percent. The percentages also fell for students in grades six through eight. In those grades, the percentage of students who said they drank alcohol in the last 30 days fell from nine percent in 2011 to 3 percent; the corresponding percentages for marijuana use fell from 4 to 3 percent. The report was released by the Avon Coalition for Every Student, which works to discourage substance abuse.