human
federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31, 2006 reconciliation of accumulated depreciation and amortization (in thousands).
| Balance, December 31, 2003 | $514,177 |
| --------- | --------- |
| Additions during period—depreciation and amortization expense | 82,551 |
| Deductions during period—disposition and retirements of property | (1,390) |
| Balance, December 31, 2004 | 595,338 |
| Additions during period—depreciation and amortization expense | 83,656 |
| Deductions during period—disposition and retirements of property | (15,244) |
| Balance, December 31, 2005 | 663,750 |
| Additions during period—depreciation and amortization expense | 89,564 |
| Deductions during period—disposition and retirements of property | (12,807) |
| Balance, December 31, 2006 | $740,507 |
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Please answer the following questions with expressions if necessary.
what were the deductions during 2004?
assistant
1390
human
what were the deductions during 2005?
assistant
15244
human
what is the sum of those deductions?
assistant
add(1390, 15244)
human
what were the deductions during 2006?
assistant
12807
human
what is the total sum of deductions for the 3 years?
assistant
add(1390, 15244), add(#0, 12807)
human
what was the total sum divided by 3?
assistant
add(1390, 15244), add(#0, 12807), divide(#1, const_3)