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.

Text: 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 ) . <table class='wikitable'><tr><td>1</td><td>balance december 31 2003</td><td>$ 514177</td></tr><tr><td>2</td><td>additions during period 2014depreciation and amortization expense</td><td>82551</td></tr><tr><td>3</td><td>deductions during period 2014disposition and retirements of property</td><td>-1390 ( 1390 )</td></tr><tr><td>4</td><td>balance december 31 2004</td><td>595338</td></tr><tr><td>5</td><td>additions during period 2014depreciation and amortization expense</td><td>83656</td></tr><tr><td>6</td><td>deductions during period 2014disposition and retirements of property</td><td>-15244 ( 15244 )</td></tr><tr><td>7</td><td>balance december 31 2005</td><td>663750</td></tr><tr><td>8</td><td>additions during period 2014depreciation and amortization expense</td><td>89564</td></tr><tr><td>9</td><td>deductions during period 2014disposition and retirements of property</td><td>-12807 ( 12807 )</td></tr><tr><td>10</td><td>balance december 31 2006</td><td>$ 740507</td></tr></table> .
Question: what were the deductions during 2004?
Answer: 1390.0
Question: what were the deductions during 2005?
Answer: 15244.0
Question: what is the sum of those deductions?

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16634.0
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