considering the years 2008-2010 , what is the value of the average deductions?\\n
federal realty investment trust schedule iii summary of real estate and accumulated depreciation - continued three years ended december 31 , 2011 reconciliation of accumulated depreciation and amortization ( in thousands ) balance , december 31 , 2008................................................................................................................................... . additions during period 2014depreciation and amortization expense .................................................................... . deductions during period 2014disposition and retirements of property ................................................................. . balance , december 31 , 2009................................................................................................................................... . additions during period 2014depreciation and amortization expense .................................................................... . deductions during period 2014disposition and retirements of property ................................................................. . balance , december 31 , 2010................................................................................................................................... . additions during period 2014depreciation and amortization expense .................................................................... . deductions during period 2014disposition and retirements of property ................................................................. . balance , december 31 , 2011................................................................................................................................... . $ 846258 103698 ( 11869 ) 938087 108261 ( 11144 ) 1035204 114180 ( 21796 ) $ 1127588 .

| 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 |
| Additions during period—depreciation and amortization expense | 108,261 |
| Deductions during period—disposition and retirements of property | (11,144) |
| Balance, December 31, 2010 | 1,035,204 |
| Additions during period—depreciation and amortization expense | 114,180 |
| Deductions during period—disposition and retirements of property | (21,796) |
| Balance, December 31, 2011 | $1,127,588 |

federal realty investment trust schedule iii summary of real estate and accumulated depreciation - continued three years ended december 31 , 2011 reconciliation of accumulated depreciation and amortization ( in thousands ) balance , december 31 , 2008................................................................................................................................... . additions during period 2014depreciation and amortization expense .................................................................... . deductions during period 2014disposition and retirements of property ................................................................. . balance , december 31 , 2009................................................................................................................................... . additions during period 2014depreciation and amortization expense .................................................................... . deductions during period 2014disposition and retirements of property ................................................................. . balance , december 31 , 2010................................................................................................................................... . additions during period 2014depreciation and amortization expense .................................................................... . deductions during period 2014disposition and retirements of property ................................................................. . balance , december 31 , 2011................................................................................................................................... . $ 846258 103698 ( 11869 ) 938087 108261 ( 11144 ) 1035204 114180 ( 21796 ) $ 1127588 .

deductions_2008 = 11869
deductions_2009 = 11144
deductions_2010 = 21796
total_deductions = deductions_2008 + deductions_2009 + deductions_2010
answer = total_deductions / 3