what is the average of the deductions during the period of 2003-2006?
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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deductions_2003_2006 = 1390 + 15244 + 12807
answer = deductions_2003_2006 / 3