Growing Problem: Substance Abuse by College Students

Did this problem recently start growing, or has it been constantly growing? If it's been growing ever since I was in college, then by this point we must be talking about a huge amount of substance.

Report warns of growing problem of substance abuse at college campuses - The Boston Globe
Substance abuse on college campuses is nothing new, but it is taking a more extreme and dangerous form, with higher rates of frequent binge drinking and ...