As you can see, the fat years in the data set appear to be 2002 through 2004. Since then, it's just been a slow trend down.
- Maybe corporate recruiters are going elsewhere other than MIT.
- Maybe MIT chemistry's recruiting is so group specific that recruiting visits are limited to groups rather than the entire department.
- Maybe this data set is incomplete (?).
This isn't so pleasant to contemplate, but maybe things will come back sooner rather than later. Maybe.