This is quite a hack, but just for the purpose of changing the label,
you can try subtracting off part of earliest year to make to 2000 (like subtract 14 from 2014)
and then change the format of the date to be Custom:
Please see workbook v10.3 attached in the Forum Thread.
278098date.twbx 13.0 KB
Right click on x-axis -> Format.
This will open a window on x-Axis .
On axis pane got under scale header ->dates -> custom and then give the format in which you want to see your dates.