Recapturing Depreciation from 21 years ago

Last year we sold our home which we had owned for 32 years.  We rented out the home from 1988-1999.  I was in the military at the time and as we wanted to return to the  home to live in after I retired, we rented it while I served in various military assignments.  In reporting the sale of the home Turbotax software asked for the depreciation I declared on the home from May 6 1977 until we returned to it in 1999.  I declared the standard MACRS deprecitation.  I do not have any documentation to support it.  I was then asked to enter the AMT depreciation for the home.  How do I calculate or recover this information.   Any ideas on how to solve this dilema?