Why do you think the Foxconn suicide figures don't include all suicide attempts by employees?

Note that one of the attempts catalogued on Wikipedia states that one Mr. 刘 "threw himself from the sixth floor of a dormitory building". That would tend to imply that the statistics cover the workers while they're on or off the job -- the statistics are for suicide attempts on campus, but the employees live on campus.

And that would tend to imply that the appropriate comparison is indeed "how many people commit suicide anywhere?", not "how many people commit suicide in the office?".