considering the years 2006-2009 , what is the value of the average additions?
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 |

.

a = 96454 + 101321
b = 1000 * 103.698
c = a + b
d = c / 3 
answer = d