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 was the ratio of the additions in 2005 to the ones in 2004?
Steps: divide(83656, 82551)
Answer: 1.01339
Question: and what is the difference between this value and the number one?
Steps: subtract(#0, const_1)
Answer: 0.01339
Question: and in the previous year of this period, what was the total of deductions?
Steps: Ask for number 1390
Answer: 1390.0
Question: what was it in 2004?
Steps: Ask for number 15244
Answer: 15244.0
Question: what was, then, the combined total for both years?
Steps: add(1390, 15244)
Answer: 16634.0
Question: including 2006, what becomes this total?
Steps: Ask for number 12807
Answer: 29441.0
Question: and what were the average deductions between the three years?

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 was the ratio of the additions in 2005 to the ones in 2004?
Steps: divide(83656, 82551)
Answer: 1.01339
Question: and what is the difference between this value and the number one?
Steps: subtract(#0, const_1)
Answer: 0.01339
Question: and in the previous year of this period, what was the total of deductions?
Steps: Ask for number 1390
Answer: 1390.0
Question: what was it in 2004?
Steps: Ask for number 15244
Answer: 15244.0
Question: what was, then, the combined total for both years?
Steps: add(1390, 15244)
Answer: 16634.0
Question: including 2006, what becomes this total?
Steps: Ask for number 12807
Answer: 29441.0
Question: and what were the average deductions between the three years?
