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 .
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
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
what is the percentual growth of the depreciation and amortization expenses during 2008 and 2009?