Oops. You’ve found a bug. It appears when you put a strictly numeric value in for text, it doesn’t match correctly. I’ll see about fixing it in the next version.
[EDIT: it turns out this is just for loose matching. If you turn that off, it should behave correctly.]
In the meantime, you could make it a number value (which admittedly would include a comma, which would be odd for a year, assuming that’s what you wanted).
Alternatively, you could make it a multiple choice question.