If you just completely forgot and have no records for a particular period of time, then you can insert something like this:
06/2010-09/2010: Temporary Housing in Singapore (3 Locations)
If that's the best you can do then so be it. Include as much precision as you're able. For example, if you can put "Serviced Apartments" instead of "Housing," do that. If you can be even more precise and put "Ascott
Serviced Apartments," do that. (Although if you remember that much you probably can find post codes.) Or "University Housing," or "HDB Sublets" -- whatever.
Consider yourself lucky, though. They only want the past 5 years. I recall one application I filled out that asked for all my residential addresses since birth. That was tougher.
