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 .

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balance december 31 2008 | $ 846258
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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
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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
Program: add(11869, 11144), add(#0, 21796), divide(#1, const_3)
Answer: 14936.33333