Gas Operations Gas Facilities O&R’s capitalized costs for utility plant, net of accumulated depreciation for gas facilities, which are primarily distribution facilities, were $476 million and $456 million at December 31, 2014 and 2013, respectively.
O&R and Pike own their gas distribution systems and O&R owns a gas transmission system.
Natural gas is delivered by pipeline to O&R at various points in or near its service territory and is distributed to customers by the company through an estimated 1,867 miles of mains and 105,077 service lines.
Gas Sales and Deliveries O&R generally recovers the cost of the gas that it buys and then sells to its full-service customers.
It does not make any margin or profit on the gas it sells.
O&R’s gas revenues are subject to a weather normalization clause.
O&R’s New York gas revenues (which accounted for substantially all of O&R’s gas revenues in 2014) are subject to a revenue decoupling mechanism.
As a result, its gas delivery revenues are generally not affected by changes in delivery volumes from levels assumed when rates were approved.
O&R’s gas sales and deliveries for the last five years were:
## Table 0 ##
For further discussion of the company’s gas operating revenues and its gas results, see “Results of Operations” in Item 7.
For additional segment information, see Note N to the financial statements in Item 8.
Gas Peak Demand The gas peak demand for firm sales customers in O&R’s service area occurs during the winter heating season.
The peak day demand during the winter 2014/2015 (through February 2, 2015) occurred on January 7, 2015 when the demand reached 191 MDt.
The 2014/2015 peak day demand included 86 MDt for O&R’s full-service customers and 105 MDt for customers participating in its gas energy choice program.
“Design weather” for the gas system is a standard to which the actual peak demand is adjusted for evaluation and planning purposes.
The company estimates that, under design weather conditions,
Shareholder Value Award Program SVAs are granted to officers and management and are payable in shares of our common stock.
The number of shares actually issued, if any, varies depending on our stock price at the end of the three-year vesting period compared to pre-established target stock prices.
We measure the fair value of the SVA unit on the grant date using a Monte Carlo simulation model.
The model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award.
Expected volatilities utilized in the model are based on implied volatilities from traded options on our stock, historical volatility of our stock price, and other factors.
Similarly, the dividend yield is based on historical experience and our estimate of future dividend yields.
The risk-free interest rate is derived from the U. S.  Treasury yield curve in effect at the time of grant.
The weighted-average fair values of the SVA units granted during the years ended December 31, 2018, 2017, and 2016 were $48.51, $66.25, and $48.68, respectively, determined using the following assumptions:
## Table 1 ##
Pursuant to this program, approximately 0.7 million shares, 1.1 million shares, and 1.0 million shares were issued during the years ended December 31, 2018, 2017, and 2016, respectively.
Approximately 1.0 million shares are expected to be issued in 2019.
As of December 31, 2018, the total remaining unrecognized compensation cost related to nonvested SVAs was $55.7 million, which will be amortized over the weighted-average remaining requisite service period of 20 months.
Restricted Stock Units RSUs are granted to certain employees and are payable in shares of our common stock.
RSU shares are accounted for at fair value based upon the closing stock price on the date of grant.
The corresponding expense is amortized over the vesting period, typically three years.
The fair values of RSU awards granted during the years ended December 31, 2018, 2017, and 2016 were $70.95, $72.47, and $71.46, respectively.
The number of shares ultimately issued for the RSU program remains constant with the exception of forfeitures.
Pursuant to this program, 1.3 million, 1.4 million, and 1.3 million shares were granted and approximately 1.0 million, 0.9 million, and 0.6 million shares were issued during the years ended December 31, 2018, 2017, and 2016, respectively.
Approximately 0.8 million shares are expected to be issued in 2019.
As of December 31, 2018, the total remaining unrecognized compensation cost related to nonvested RSUs was $112.2 million, which will be amortized over the weightedaverage remaining requisite service period of 21 months.
Note 12: Shareholders' Equity During 2018, 2017, and 2016, we repurchased $4.15 billion, $359.8 million and $540.1 million, respectively, of shares associated with our share repurchase programs.
A payment of $60.0 million was made in 2016 for shares repurchased in 2017.
During 2018, we repurchased $2.05 billion of shares, which completed the $5.00 billion share repurchase program announced in October 2013 and our board authorized an $8.00 billion share repurchase program.
There were $2.10 billion repurchased under the $8.00 billion program in 2018.
As of December 31, 2018, there were $5.90 billion of shares remaining under the 2018 program.
We have 5.0 million authorized shares of preferred stock.
As of December 31, 2018 and 2017, no preferred stock was issued.
We have an employee benefit trust that held 50.0 million shares of our common stock at both December 31, 2018 and 2017, to provide a source of funds to assist us in meeting our obligations under various employee benefit plans.
The cost basis of the shares held in the trust was $3.01 billion at both December 31, 2018 and 2017, and is shown as a reduction of shareholders’ equity.
Any dividend transactions between us and the trust are eliminated.
Stock held by the trust is not considered outstanding in the computation of EPS.
The assets of the trust were not used to fund any of our obligations under these employee benefit plans during the years ended December 31, 2018, 2017, and 2016.
CONTRACTUAL OBLIGATIONS We typically have various contractual obligations, which are recorded as liabilities in our consolidated balance sheets, while other items, such as certain purchase commitments and other executory contracts, are not recognized, but are disclosed herein.
For example, we are contractually committed to contracts for information-technology outsourcing, certain enterprise-wide informationtechnology software licensing and maintenance and make certain minimum lease payments for the use of property under operating lease agreements.
We believe that the amount of cash and cash equivalents on hand, cash flow expected from operations and availability under our credit facility will be adequate for us to execute our business strategy and meet anticipated requirements for lease obligations, capital expenditures, working capital and debt service for 2019.
The following table summarizes our significant contractual obligations and commercial commitments as of December 31, 2018, over the next several years.
Additional details regarding these obligations are provided in the notes to our consolidated financial statements, as referenced in the footnotes to the table:
## Table 2 ##
1 Our debt obligations are described in Note 5 – Debt to our consolidated financial statements.2 Amounts shown include taxes and escalation payments, see Note 13 – Commitments and Contingencies to our consolidated financial statements for further discussion on our operating lease obligations.3 Other consists primarily of commitments for unconditional purchase obligations in contracts for information-technology outsourcing and certain enterprise-wide information-technology software licensing and maintenance.
As of December 31, 2018, we had $147 million of liabilities for unrecognized tax benefits.
We have excluded the liabilities for unrecognized tax benefits from our contractual obligations table because, until formal resolutions are reached, reasonable estimates of the timing of cash settlements with the respective taxing authorities are not practicable.
As of December 31, 2018, we have recorded $1,620 million for our redeemable noncontrolling interest in our S&P Dow Jones Indices LLC partnership discussed in Note 9 – Equity to our consolidated financial statements.
Specifically, this amount relates to the put option under the terms of the operating agreement of S&P Dow Jones Indices LLC, whereby, after December 31, 2017, CME Group and CME Group Index Services LLC (“CGIS”) has the right at any time to sell, and we are obligated to buy, at least 20% of their share in S&P Dow Jones Indices LLC.
We have excluded this amount from our contractual obligations table because we are uncertain as to the timing and the ultimate amount of the potential payment we may be required to make.
We make contributions to our pension and postretirement plans in order to satisfy minimum funding requirements as well as additional contributions that we consider appropriate to improve the funded status of our plans.
During 2018, we contributed $9 million and $1 million to our retirement and postretirement plans, respectively.
Expected employer contributions in 2019 are $46 million and $6 million for our retirement and postretirement plans, respectively.
In 2019, we may elect to make additional nonrequired contributions depending on investment performance and the pension plan status.
See Note 7 – Employee Benefits to our consolidated financial statements for further discussion.
OFF-BALANCE SHEET ARRANGEMENTS As of December 31, 2018 and 2017, we did not have any material relationships with unconsolidated entities, such as entities often referred to as specific purpose or variable interest entities where we are the primary beneficiary, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.
As such we are not exposed to any financial liquidity, market or credit risk that could arise if we had engaged in such relationships.

Tables referenced above, in order (Table 0 first):
<table><tr><td></td><td colspan="5"> Year Ended December 31,</td></tr><tr><td></td><td> 2010</td><td> 2011</td><td> 2012</td><td> 2013</td><td> 2014</td></tr><tr><td> Gas Delivered (MDt)</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Firm Sales</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Full service</td><td>8,772</td><td>8,384</td><td>7,539</td><td>8,808</td><td>9,529</td></tr><tr><td>Firm transportation</td><td>10,692</td><td>10,823</td><td>10,505</td><td>12,062</td><td>12,592</td></tr><tr><td> Total Firm Sales</td><td>19,464</td><td>19,207</td><td>18,044</td><td>20,870</td><td>22,121</td></tr><tr><td>Interruptible Sales</td><td>4,497</td><td>4,184</td><td>4,326</td><td>4,118</td><td>4,216</td></tr><tr><td> Total Gas Delivered to O&R Customers</td><td>23,961</td><td>23,391</td><td>22,370</td><td>24,988</td><td>26,337</td></tr><tr><td>Transportation of customer-owned gas</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Sales for resale</td><td>840</td><td>864</td><td>793</td><td>885</td><td>945</td></tr><tr><td>Sales to electric generating stations</td><td>19</td><td>24</td><td>15</td><td>19</td><td>70</td></tr><tr><td>Off-System Sales</td><td>1</td><td>-</td><td>-</td><td>-</td><td>3</td></tr><tr><td> Total Sales</td><td>24,821</td><td>24,279</td><td>23,178</td><td>25,892</td><td>27,355</td></tr><tr><td> Gas Delivered ($ in millions)</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Firm Sales</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Full service</td><td>$131</td><td>$122</td><td>$103</td><td>$115</td><td>$121</td></tr><tr><td>Firm transportation</td><td>65</td><td>71</td><td>76</td><td>77</td><td>75</td></tr><tr><td> Total Firm Sales</td><td>196</td><td>193</td><td>179</td><td>192</td><td>196</td></tr><tr><td>Interruptible Sales</td><td>9</td><td>4</td><td>4</td><td>3</td><td>2</td></tr><tr><td> Total Gas Delivered to O&R Customers</td><td>205</td><td>197</td><td>183</td><td>195</td><td>198</td></tr><tr><td>Transportation of customer-owned gas</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Sales to electric generating stations</td><td>-</td><td>1</td><td>-</td><td>-</td><td>1</td></tr><tr><td>Other operating revenues</td><td>13</td><td>16</td><td>20</td><td>10</td><td>13</td></tr><tr><td> Total Sales</td><td>$218</td><td>$214</td><td>$203</td><td>$205</td><td>$212</td></tr><tr><td> Average Revenue Per Dt Sold</td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Residential</td><td>$15.20</td><td>$14.84</td><td>$14.01</td><td>$13.31</td><td>$13.01</td></tr><tr><td>General</td><td>$13.64</td><td>$13.20</td><td>$11.99</td><td>$11.53</td><td>$11.30</td></tr></table>
<table><tr><td>(Percents)</td><td>2018</td><td>2017</td><td>2016</td></tr><tr><td>Expected dividend yield</td><td>2.50%</td><td>2.50%</td><td>2.00%</td></tr><tr><td>Risk-free interest rate</td><td>2.31</td><td>1.38</td><td>0.92</td></tr><tr><td>Volatility</td><td>22.26</td><td>22.91</td><td>21.68</td></tr></table>
<table><tr><td>(in millions)</td><td>Less than 1Year</td><td>1-3 Years</td><td>3-5 Years</td><td>More than 5Years</td><td>Total</td></tr><tr><td>Debt:<sup>1</sup></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Principal payments</td><td>$—</td><td>$698</td><td>$—</td><td>$2,964</td><td>$3,662</td></tr><tr><td>Interest payments</td><td>154</td><td>277</td><td>262</td><td>1,096</td><td>1,789</td></tr><tr><td>Operating leases<sup>2</sup></td><td>130</td><td>187</td><td>142</td><td>400</td><td>859</td></tr><tr><td>Purchase obligations and other<sup>3</sup></td><td>83</td><td>57</td><td>34</td><td>49</td><td>223</td></tr><tr><td>Total contractual cash obligations</td><td>$367</td><td>$1,219</td><td>$438</td><td>$4,509</td><td>$6,533</td></tr></table>

Question: what was the percentage change in dollars spent on share repurchase between 2016 and 2017?
Answer: -0.33383
Reasoning program: subtract(359.8,540.1), divide(#0,540.1)