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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 was the ratio of the additions in 2005 to the ones in 2004?
assistant
divide(83656, 82551)
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and what is the difference between this value and the number one?
assistant
divide(83656, 82551), subtract(#0, const_1)
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and in the previous year of this period, what was the total of deductions?
assistant
1390
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what was it in 2004?
assistant
15244
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what was, then, the combined total for both years?
assistant
add(1390, 15244)
human
n/a
assistant
12807
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including 2006, what becomes this total?
assistant
add(1390, 15244), add(#0, 12807)