Year taxonomy field not importing

I've created a CSV importer that creates new nodes. Paired with Feeds Tamper and Media Feeds, I've been able to accomplish most everything I needed.

However, I have one field that isn't importing. I've created a taxonomy vocabulary for Year (i.e. 2011, 2012, etc.). The taxonomy reference on the Node is an autocomplete field (not sure if that matters). If the value for the imported field is a year (i.e. integer), it is ignored. If I add a non-numeric character (i.e. 2011a), it imports fine. Including quotation marks around the year doesn't help.

Is this because it is assuming the integer is a tid instead of the term name? Any recommendations on how to avoid this?