Force axis range

I am reporting on some AdWords campaigns. One particular campaign only ran for a few months per year. My date range is 2010 - 2012. For the report on that campaign, the x-axis truncates to only three months. I want it to show all months in the range to make the report conform with the others and convey the window as only being a portion of the time covered. However, I cannot figure out how to force the date range on the axis. The report filter is set to all the months in the range.

I imagine this is simple but I cannot find the trick. Any help would be welcome.