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', '$ 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
Explanation: it is the sum of all deductions divided by the sum of the years .