federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31 , 2009 reconciliation of accumulated depreciation and amortization ( in thousands ) .
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Balance, December 31, 2006 $740,507
Additions during period—depreciation and amortization expense 96,454
Deductions during period—disposition and retirements of property (80,258)
Balance, December 31, 2007 756,703
Additions during period—depreciation and amortization expense 101,321
Deductions during period—disposition and retirements of property (11,766)
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
balance december 31 2006 $ 740507
additions during period 2014depreciation and amortization expense 96454
deductions during period 2014disposition and retirements of property -80258 ( 80258 )
balance december 31 2007 756703
additions during period 2014depreciation and amortization expense 101321
deductions during period 2014disposition and retirements of property -11766 ( 11766 )
balance december 31 2008 846258
additions during period 2014depreciation and amortization expense 103.698
deductions during period 2014disposition and retirements of property -11869 ( 11869 )
balance december 31 2009 $ 938087
considering the years 2006-2009 , what is the value of the average additions?