NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued) 93 Note 3—Financial Instruments (Continued) Accounts Receivable Trade Receivables The Company distributes its products through third-party distributors and resellers and directly to certain education, consumer, and commercial customers.
The Company generally does not require collateral from its customers; however, the Company will require collateral in certain instances to limit credit risk.
In addition, when possible, the Company does attempt to limit credit risk on trade receivables with credit insurance for certain customers in Latin America, Europe, Asia, and Australia and by arranging with third- party financing companies to provide flooring arrangements and other loan and lease programs to the Company’s direct customers.
These credit-financing arrangements are directly between the third-party financing company and the end customer.
As such, the Company generally does not assume any recourse or credit risk sharing related to any of these arrangements.
However, considerable trade receivables that are not covered by collateral, third-party flooring arrangements, or credit insurance are outstanding with the Company’s distribution and retail channel partners.
No customer accounted for more than 10% of trade receivables as of September 30, 2006 or September 24, 2005.
The following table summarizes the activity in the allowance for doubtful accounts (in millions):
## Table 0 ##
(a) Represents amounts written off against the allowance, net of recoveries.
Vendor Non-Trade Receivables The Company has non-trade receivables from certain of its manufacturing vendors resulting from the sale of raw material components to these manufacturing vendors who manufacture sub-assemblies or assemble final products for the Company.
The Company purchases these raw material components directly from suppliers.
These non-trade receivables, which are included in the consolidated balance sheets in other current assets, totaled $1.6 billion and $417 million as of September 30, 2006 and September 24, 2005, respectively.
The Company does not reflect the sale of these components in net sales and does not recognize any profits on these sales until the products are sold through to the end customer at which time the profit is recognized as a reduction of cost of sales.
Derivative Financial Instruments The Company uses derivatives to partially offset its business exposure to foreign exchange risk.
Foreign currency forward and option contracts are used to offset the foreign exchange risk on certain existing assets and liabilities and to hedge the foreign exchange risk on expected future cash flows on certain forecasted revenue and cost of sales.
From time to time, the Company enters into interest rate derivative agreements to modify the interest rate profile of certain investments and debt.
The Company’s accounting policies for these instruments are based on whether the instruments are designated as hedge or non-hedge instruments.
The Company records all derivatives on the balance sheet at fair value.
CBRE GROUP, INC.  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) outstanding according to their terms, and we will continue to issue shares to the extent required under the terms of such outstanding awards.
Shares underlying awards that expire, terminate or lapse under the 2004 stock incentive plan will become available for grant under the 2012 equity incentive plan.2012 Equity Incentive Plan.
Our 2012 equity incentive plan was adopted by our board of directors and approved by our stockholders on May 8, 2012.
The 2012 equity incentive plan authorizes the grant of stockbased awards to our employees, directors or independent contractors.
Unless terminated earlier, the 2012 equity incentive plan will terminate on February 13, 2022.
A total of 16,000,000 shares of our Class A common stock plus 2,205,887 unissued shares that remained under the 2004 stock incentive plan were reserved for issuance under the 2012 equity incentive plan.
Additionally, shares underlying awards that expire, terminate or lapse under the 2012 equity incentive plan or under the 2004 stock incentive plan will become available for issuance under the 2012 equity incentive plan.
No person is eligible to be granted performance-based awards in the aggregate covering more than 3,300,000 shares during any fiscal year or cash awards in excess of $5,000,000 for any fiscal year.
The number of shares issued or reserved pursuant to the 2012 equity incentive plan, or pursuant to outstanding awards, is subject to adjustment on account of a stock split of our outstanding shares, stock dividend, dividend payable in a form other than shares in an amount that has a material effect on the price of the shares, consolidation, combination or reclassification of the shares, recapitalization, spin-off, or other similar occurrence.
Stock options and stock appreciation rights granted under the 2012 equity incentive plan are subject to a maximum term of ten years from the date of grant.
Restricted share and restricted stock unit awards that have only time-based service vesting conditions are generally subject to a minimum three year vesting schedule.
Restricted share and restricted stock unit awards that have performance-based vesting conditions are generally subject to a minimum one year vesting schedule.
As of December 31, 2014, assuming the maximum number of shares under our performance-based awards will later be issued (as further described under “Equity Compensation Plan Information” below), 12,163,174 shares remained available for future grants under this plan.
Stock Options As of December 31, 2014, no shares were subject to options issued under our 2012 equity incentive plan.
No options were granted during the years ended December 31, 2014, 2013 and 2012.
All options that have been granted under the 2004 stock incentive plan have a term of five or seven years from the date of grant.
A summary of the status of our outstanding stock options is presented in the tables below:
## Table 1 ##
Due to the constantly changing currency exposures to which we are subject and the volatility of currency exchange rates, we cannot predict the effect of exchange rate fluctuations upon future operating results.
In addition, fluctuations in currencies relative to the U. S.  dollar may make it more difficult to perform period-to-period comparisons of our reported results of operations.
Our international operations also are subject to, among other things, political instability and changing regulatory environments, which affects the currency markets and which as a result may adversely affect our future financial condition and results of operations.
We routinely monitor these risks and related costs and evaluate the appropriate amount of oversight to allocate towards business activities in foreign countries where such risks and costs are particularly significant.
Results of Operations The following table sets forth items derived from our consolidated statements of operations for the years ended December 31, 2016, 2015 and 2014 (dollars in thousands):
## Table 2 ##
Fee revenue, EBITDA and adjusted EBITDA are not recognized measurements under GAAP.
When analyzing our operating performance, investors should use these measures in addition to, and not as an alternative for, their most directly comparable financial measure calculated and presented in accordance with GAAP.
We
CBRE GROUP, INC.  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued) 82 In March 2011, we entered into five interest rate swap agreements, all with effective dates in October 2011, and immediately designated them as cash flow hedges in accordance with FASB ASC Topic 815.
The purpose of these interest rate swap agreements is to attempt to hedge potential changes to our cash flows due to the variable interest nature of our senior term loan facilities.
The total notional amount of these interest rate swap agreements is $400.0 million, with $200.0 million having expired in October 2017 and $200.0 million expiring in September 2019.
The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings.
There was no significant hedge ineffectiveness for the years ended December 31, 2017, 2016 and 2015.
The effective portion of changes in the fair value of derivatives designated and qualifying as cash flow hedges is recorded in accumulated other comprehensive loss on the balance sheet and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings.
We reclassified $7.4 million, $10.7 million and $11.9 million for the years ended December 31, 2017, 2016, and 2015, respectively, from accumulated other comprehensive loss to interest expense.
During the next twelve months, we estimate that $3.1 million will be reclassified from accumulated other comprehensive loss to interest expense.
In addition, we recorded a net gain of $0.9 million, and net losses of $2.4 million and $6.5 million for the years ended December 31, 2017, 2016 and 2015, respectively, to other comprehensive loss in relation to such interest rate swap agreements.
As of December 31, 2017 and 2016, the fair values of such interest rate swap agreements were reflected as a $4.8 million liability and a $13.2 million liability, respectively, and were included in other liabilities in the accompanying consolidated balance sheets.
Additionally, our foreign operations expose us to fluctuations in foreign exchange rates.
These fluctuations may impact the value of our cash receipts and payments in terms of our functional (reporting) currency, which is U. S.  dollars.
We enter into derivative financial instruments to attempt to protect the value or fix the amount of certain obligations in terms of our reporting currency, the U. S.  dollar.
In March 2014, we began a foreign currency exchange forward hedging program by entering into foreign currency exchange forward contracts, including agreements to buy U. S.  dollars and sell Australian dollars, British pound sterling, Canadian dollars, euros and Japanese yen.
The purpose of these forward contracts was to attempt to mitigate the risk of fluctuations in foreign currency exchange rates that would adversely impact some of our foreign currency denominated EBITDA.
Hedge accounting was not elected for any of these contracts.
As such, changes in the fair values of these contracts were recorded directly in earnings.
As of December 31, 2017 and 2016, we had no foreign currency exchange forward contracts outstanding as the program expired in December 2016.
Included in the consolidated statement of operations were net gains of $7.7 million and $24.2 million for the years ended December 31, 2016 and 2015, respectively, resulting from net gains on foreign currency exchange forward contracts.
We also routinely monitor our exposure to currency exchange rate changes in connection with certain transactions and sometimes enter into foreign currency exchange option and forward contracts to limit our exposure to such transactions, as appropriate.
In the ordinary course of business, we also sometimes utilize derivative financial instruments in the form of foreign currency exchange contracts to attempt to mitigate foreign currency exchange exposure resulting from intercompany loans.
The net impact on our financial position and earnings resulting from these foreign currency exchange forward and options contracts has not been significant.8.
Property and Equipment Property and equipment consists of the following (dollars in thousands)

Tables referenced above, in order (Table 0 first):
<table><tr><td></td><td>September 30, 2006</td><td>September 24, 2005</td><td>September 25, 2004</td></tr><tr><td>Beginning allowance balance</td><td>$46</td><td>$47</td><td>$49</td></tr><tr><td>Charged to costs and expenses</td><td>17</td><td>8</td><td>3</td></tr><tr><td>Deductions(a)</td><td>-11</td><td>-9</td><td>-5</td></tr><tr><td>Ending allowance balance</td><td>$52</td><td>$46</td><td>$47</td></tr></table>
<table><tr><td></td><td>Shares</td><td> Weighted Average Exercise Price</td></tr><tr><td>Outstanding at December 31, 2011</td><td>4,792,409</td><td>$8.95</td></tr><tr><td>Exercised</td><td>-1,930,092</td><td>10.31</td></tr><tr><td>Forfeited</td><td>-33,381</td><td>10.73</td></tr><tr><td>Expired</td><td>-17,997</td><td>14.36</td></tr><tr><td>Outstanding at December 31, 2012</td><td>2,810,939</td><td>$7.93</td></tr><tr><td>Exercised</td><td>-1,620,515</td><td>3.45</td></tr><tr><td>Forfeited</td><td>-2,009</td><td>13.85</td></tr><tr><td>Expired</td><td>-39,666</td><td>23.08</td></tr><tr><td>Outstanding at December 31, 2013</td><td>1,148,749</td><td>$13.60</td></tr><tr><td>Exercised</td><td>-458,505</td><td>13.81</td></tr><tr><td>Expired</td><td>-11,906</td><td>33.03</td></tr><tr><td>Outstanding at December 31, 2014</td><td>678,338</td><td>$13.21</td></tr><tr><td>Vested and expected to vest at December 31, 2014</td><td>678,338</td><td>$13.21</td></tr><tr><td>Exercisable at December 31, 2014</td><td>678,338</td><td>$13.21</td></tr></table>
<table><tr><td></td><td colspan="6"> Year Ended December 31,</td></tr><tr><td></td><td colspan="2">2016</td><td colspan="2">2015</td><td colspan="2"> 2014</td></tr><tr><td>Revenue:</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Fee revenue</td><td>$8,717,126</td><td>66.7%</td><td>$7,730,337</td><td>71.2%</td><td>$6,791,292</td><td>75.0%</td></tr><tr><td>Pass through costs also recognized as revenue</td><td>4,354,463</td><td>33.3%</td><td>3,125,473</td><td>28.8%</td><td>2,258,626</td><td>25.0%</td></tr><tr><td>Total revenue</td><td>13,071,589</td><td>100.0%</td><td>10,855,810</td><td>100.0%</td><td>9,049,918</td><td>100.0%</td></tr><tr><td>Costs and expenses:</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Cost of services</td><td>9,123,727</td><td>69.8%</td><td>7,082,932</td><td>65.2%</td><td>5,611,262</td><td>62.0%</td></tr><tr><td>Operating, administrative and other</td><td>2,781,310</td><td>21.3%</td><td>2,633,609</td><td>24.3%</td><td>2,438,960</td><td>27.0%</td></tr><tr><td>Depreciation and amortization</td><td>366,927</td><td>2.8%</td><td>314,096</td><td>2.9%</td><td>265,101</td><td>2.9%</td></tr><tr><td>Total costs and expenses</td><td>12,271,964</td><td>93.9%</td><td>10,030,637</td><td>92.4%</td><td>8,315,323</td><td>91.9%</td></tr><tr><td>Gain on disposition of real estate</td><td>15,862</td><td>0.1%</td><td>10,771</td><td>0.1%</td><td>57,659</td><td>0.7%</td></tr><tr><td>Operating income</td><td>815,487</td><td>6.2%</td><td>835,944</td><td>7.7%</td><td>792,254</td><td>8.8%</td></tr><tr><td>Equity income from unconsolidated subsidiaries</td><td>197,351</td><td>1.5%</td><td>162,849</td><td>1.5%</td><td>101,714</td><td>1.1%</td></tr><tr><td>Other income (loss)</td><td>4,688</td><td>—</td><td>-3,809</td><td>—</td><td>12,183</td><td>0.1%</td></tr><tr><td>Interest income</td><td>8,051</td><td>0.1%</td><td>6,311</td><td>—</td><td>6,233</td><td>0.1%</td></tr><tr><td>Interest expense</td><td>144,851</td><td>1.1%</td><td>118,880</td><td>1.1%</td><td>112,035</td><td>1.2%</td></tr><tr><td>Write-offof financing costs on extinguished debt</td><td>—</td><td>—</td><td>2,685</td><td>—</td><td>23,087</td><td>0.3%</td></tr><tr><td>Income before provision for income taxes</td><td>880,726</td><td>6.7%</td><td>879,730</td><td>8.1%</td><td>777,262</td><td>8.6%</td></tr><tr><td>Provision for income taxes</td><td>296,662</td><td>2.2%</td><td>320,853</td><td>3.0%</td><td>263,759</td><td>2.9%</td></tr><tr><td>Net income</td><td>584,064</td><td>4.5%</td><td>558,877</td><td>5.1%</td><td>513,503</td><td>5.7%</td></tr><tr><td>Less: Net income attributable tonon-controllinginterests</td><td>12,091</td><td>0.1%</td><td>11,745</td><td>0.1%</td><td>29,000</td><td>0.3%</td></tr><tr><td>Net income attributable to CBRE Group, Inc.</td><td>$571,973</td><td>4.4%</td><td>$547,132</td><td>5.0%</td><td>$484,503</td><td>5.4%</td></tr><tr><td>EBITDA</td><td>$1,372,362</td><td>10.5%</td><td>$1,297,335</td><td>12.0%</td><td>$1,142,252</td><td>12.6%</td></tr><tr><td>Adjusted EBITDA</td><td>$1,561,003</td><td>11.9%</td><td>$1,412,724</td><td>13.0%</td><td>$1,166,125</td><td>12.9%</td></tr></table>

Question: by how much did the allowance for doubtful accounts increase from 2005 to 2006?
Answer: 0.13043
Reasoning program: subtract(52,46), divide(#0,46)