pre_text: 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 ) .
post_text: .
table: Balance, December 31, 2006 $740,507
table: Additions during period—depreciation and amortization expense 96,454
table: Deductions during period—disposition and retirements of property (80,258)
table: Balance, December 31, 2007 756,703
table: Additions during period—depreciation and amortization expense 101,321
table: Deductions during period—disposition and retirements of property (11,766)
table: Balance, December 31, 2008 846,258
table: Additions during period—depreciation and amortization expense 103.698
table: Deductions during period—disposition and retirements of property (11,869)
table: Balance, December 31, 2009 $938,087
question: Analyse this data from a financial earnings document. considering the years 2006-2009 , what is the value of the average additions?