human
federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31, 2007 reconciliation of accumulated depreciation and amortization (in thousands).
| 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 |
| Additions during period—depreciation and amortization expense | 96,454 |
| Deductions during period—disposition and retirements of property | (80,258) |
| Balance, December 31, 2007 | $756,703 |
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Please answer the following questions with expressions if necessary.
what was the variation in the additions during 2005 and 2006?
assistant
subtract(89564, 83656)
human
and the increase in the deductions in 2006 and 2007?
assistant
subtract(80258, 12807)