100
The rate of marijuana use has gone up 2.5x since usage rates in this former decade.
What is the 90's?
One in every 20 college students was smoking pot on a daily or near-daily basis in 2013, including one in every 11 males and one in every 34 females. To put this into a longer-term perspective, from 1990 to 1994, fewer than one in 50 college students used marijuana that frequently."