Trigger automatic export to CSV while saving the Numbers Sheet

Is it possible to trigger automatic CSV export of a .numbers file while saving / closing? The thing is, I'd like to keep two versions of the same file. One with the .numbers extension, where you can have nice formatting, filtering, etc, and a pure .csv which is obviously more convenient to work with for programming purposes. What is more, I don't want my co-worker to export the file by hand every time they change something because it will surely lead to a lot of sync errors and is a pain in the neck. The best would be something like On save trigger connected with a certain .numbers document defined in AppleScript, but I am not sure if AS supports something like that. In such a case, does anybody have any ideas on how to achieve such a goal?