federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31 , 2006 reconciliation of accumulated depreciation and amortization ( in thousands ) . balance december 31 2003                                             | $ 514177        
additions during period 2014depreciation and amortization expense    | 82551           
deductions during period 2014disposition and retirements of property | -1390 ( 1390 )  
balance december 31 2004                                             | 595338          
additions during period 2014depreciation and amortization expense    | 83656           
deductions during period 2014disposition and retirements of property | -15244 ( 15244 )
balance december 31 2005                                             | 663750          
additions during period 2014depreciation and amortization expense    | 89564           
deductions during period 2014disposition and retirements of property | -12807 ( 12807 )
balance december 31 2006                                             | $ 740507         .
Question: what were the deductions during 2004?
Steps: Ask for number 1390
Answer: 1390.0
Question: what were the deductions during 2005?
Steps: Ask for number 15244
Answer: 15244.0
Question: what is the sum of those deductions?

Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.
federal realty investment trust schedule iii summary of real estate and accumulated depreciation 2014continued three years ended december 31 , 2006 reconciliation of accumulated depreciation and amortization ( in thousands ) . balance december 31 2003                                             | $ 514177        
additions during period 2014depreciation and amortization expense    | 82551           
deductions during period 2014disposition and retirements of property | -1390 ( 1390 )  
balance december 31 2004                                             | 595338          
additions during period 2014depreciation and amortization expense    | 83656           
deductions during period 2014disposition and retirements of property | -15244 ( 15244 )
balance december 31 2005                                             | 663750          
additions during period 2014depreciation and amortization expense    | 89564           
deductions during period 2014disposition and retirements of property | -12807 ( 12807 )
balance december 31 2006                                             | $ 740507         .
Question: what were the deductions during 2004?
Steps: Ask for number 1390
Answer: 1390.0
Question: what were the deductions during 2005?
Steps: Ask for number 15244
Answer: 15244.0
Question: what is the sum of those deductions?
