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 .

Table:
balance december 31 2008 | $ 846258
additions during period 2014depreciation and amortization expense | 103698
deductions during period 2014disposition and retirements of property | -11869 ( 11869 )
balance december 31 2009 | 938087
additions during period 2014depreciation and amortization expense | 108261
deductions during period 2014disposition and retirements of property | -11144 ( 11144 )
balance december 31 2010 | 1035204
additions during period 2014depreciation and amortization expense | 114180
deductions during period 2014disposition and retirements of property | -21796 ( 21796 )
balance december 31 2011 | $ 1127588
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 .

Question: considering the years 2008-2010 , what is the value of the average deductions?\\n
Answer: 14936.33
Calculation: add(11869, 11144), add(#0, 21796), divide(#1, const_3)