human
federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31, 2009 reconciliation of accumulated depreciation and amortization (in thousands).
| 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 |
| Additions during period—depreciation and amortization expense | 101,321 |
| Deductions during period—disposition and retirements of property | (11,766) |
| Balance, December 31, 2008 | 846,258 |
| Additions during period—depreciation and amortization expense | 103.698 |
| Deductions during period—disposition and retirements of property | (11,869) |
| Balance, December 31, 2009 | $938,087 |
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Please answer the following question with expressions if necessary.
so what is the average of these values?
assistant
add(96454, 101321), multiply(const_1000, 103.698), add(#0, #1), divide(#2, const_3)