During 2012, the Company closed on 10 acquisitions of various regulated water and wastewater systems for a total aggregate purchase price of $44,560.
Included in this total was the Company’s May 1, 2012 acquisition of all of the capital stock of Aqua New York, Inc.  for a total cash purchase price of $36,688 plus assumed liabilities.
Assets acquired in the Aqua New York acquisition totaled $102,727, including $59,139 of plant, $27,400 of regulatory assets, and $12,181 of goodwill; liabilities assumed totaled $66,039, including long-term debt of $25,215, $11,885 of regulatory liabilities, $15,424 of deferred taxes, $1,708 of other liabilities, $1,060 of contributions in aid of construction and $9,710 of pension and postretirement welfare liabilities.
Assets acquired (primarily utility plant) in the other nine acquisitions during 2012 totaled $12,514; liabilities assumed totaled $4,642.
During 2011, the Company closed on nine acquisitions of regulated water and wastewater systems for an aggregate purchase price of $7,220.
The purchase price for each acquisition was allocated to the net tangible and intangible assets based upon their estimated fair values at the acquisition date.
Assets acquired totaled $12,919, of which $12,814 was utility plant.
Liabilities assumed totaled $4,945, including contributions in aid of construction of $3,847 .
The Company recorded gains on acquisitions during 2011 totaling $754.
Divestitures In January 2012, the Company completed the sale of its Arizona and New Mexico subsidiaries.
After postclose adjustments, net proceeds from the sale totaled $458,860, and the Company recorded a pretax loss on sale of $2,198.
In May 2012, the Company completed the sale of its Ohio subsidiary.
After post-close adjustments, net proceeds from the sale totaled $102,154, and the Company recorded a pretax loss on sale of $4,095.
In December 2011, the Company completed the sale of its Applied Water Management subsidiary, part of its Market-Based Operations segment.
Proceeds from the sale totaled $2,923.
The Company recorded a pretax loss on sale of $3,126 in 2011.
In 2012, the Company recorded an additional pretax loss of $114 for certain postclose adjustments .
In June 2011, the Company completed the sale of the assets of its Texas subsidiary for proceeds of $6,245.
In the first quarter of 2011, the Company recognized an after-tax impairment charge of $552 for parent company goodwill allocated to the Texas subsidiary.
Operating results and the financial position of the five subsidiaries named above are included in the accompanying financial statements as discontinued operations.
A summary of discontinued operations presented in the Consolidated Statements of Operations and Comprehensive Income follows:
## Table 0 ##
coupons and expected maturity values of individually selected bonds.
The yield curve was developed for a universe containing the majority of U. S. -issued AA-graded corporate bonds, all of which were non callable (or callable with make-whole provisions).
Historically, for each plan, the discount rate was developed as the level equivalent rate that would produce the same present value as that using spot rates aligned with the projected benefit payments.
The expected long-term rate of return on plan assets is based on historical and projected rates of return, prior to administrative and investment management fees, for current and planned asset classes in the plans’ investment portfolios.
Assumed projected rates of return for each of the plans’ projected asset classes were selected after analyzing historical experience and future expectations of the returns and volatility of the various asset classes.
Based on the target asset allocation for each asset class, the overall expected rate of return for the portfolio was developed, adjusted for historical and expected experience of active portfolio management results compared to the benchmark returns and for the effect of expenses paid from plan assets.
The Company’s pension expense increases as the expected return on assets decreases.
Assumed health care cost trend rates have a significant effect on the amounts reported for the other postretirement benefit plans.
The health care cost trend rate is based on historical rates and expected market conditions.
A one-percentage-point change in assumed health care cost trend rates would have the following effects:
## Table 1 ##
reduce water usage by 20% by 2020.
This progressive regulation enables utilities to encourage water efficiency, as revenues are not tied to sales.
Similarly, New York has implemented a surcharge or credit based on the difference between actual net revenues and the revenues allowed in the most recent rate order.
California also has a multi-year cost of capital proceeding outside of the general rate case process.
This proceeding authorizes the utility’s capital structure and authorized rates of return, as well as provides an automatic adjustment mechanism that triggers an adjustment to the authorized cost of capital if the Moody’s utility bond index changes beyond certain thresholds on an annual basis.
We pursue positive regulatory policies as part of our rate and revenue management program to enhance our ability to provide high quality, sustainable, cost effective service to customers, to facilitate efficient recovery of our costs and investments, and to ensure positive short-term liquidity and long-term profitability for a financially stable company which benefits our customers, employees and shareholders.
The ability to seek regulatory treatment as described above does not guarantee that the state PUCs will accept our proposal in the context of a particular rate case, and these policies will reduce, but not eliminate, regulatory lag associated with traditional rate making processes.
However, the Company strives to use these and other regulatory policies to address issues of regulatory lag wherever appropriate.
It is also our strategy to expand their use in areas where they may not currently apply.
Customers We have a large and geographically diverse customer base in our Regulated Businesses.
An active customer is defined as a party with an active agreement to receive a specific service from a connection to our water or wastewater system as of the last business day of each monthly reporting period.
Also, as in the case of apartment complexes, businesses and many homes, multiple individuals may be served by a single contract.
Residential customers make up the majority of our customer base in all of the states in which we operate.
In 2014, residential customers accounted for 91.0% of the customers, 59.3% of the operating revenues and approximately 50.4% of the billed water sales of our Regulated Businesses.
We also serve commercial customers, such as shops and businesses; industrial customers, such as large-scale manufacturing and production operations; and public authorities, such as government buildings and other public sector facilities, including schools.
We also supply water to public fire hydrants for firefighting purposes, to private fire customers for use in fire suppression systems in office buildings and other facilities, as well as providing bulk water supplies to other water utilities for distribution to their own customers.
The vast majority of our regulated water customers are metered, which allows us to measure and bill for our customers’ water consumption, typically on a monthly basis.
Our wastewater customers are billed either on a fixed charge basis or based on their water consumption.
In fiscal year 2014, no single Regulated Businesses customer accounted for more than 10% of our consolidated annual operating revenues.
The following table sets forth the number of water and wastewater customers (by customer class) for our Regulated Businesses as of December 31, 2014, 2013, and 2012:
## Table 2 ##

<table><tr><td></td><td colspan="4">Years Ended December31,</td></tr><tr><td></td><td></td><td>2013</td><td>2012</td><td>2011</td></tr><tr><td>Operating revenues</td><td>$</td><td>0</td><td>$19,377</td><td>$173,447</td></tr><tr><td>Total operating expenses, net</td><td></td><td>0</td><td>27,630</td><td>147,012</td></tr><tr><td>Operating income (loss)</td><td></td><td>0</td><td>-8,253</td><td>26,435</td></tr><tr><td>Other income (expense), net</td><td></td><td>0</td><td>-168</td><td>-270</td></tr><tr><td>Income (loss) from discontinued operations before tax</td><td></td><td>0</td><td>-8,421</td><td>26,165</td></tr><tr><td>Provision for income taxes</td><td></td><td>0</td><td>7,759</td><td>21,481</td></tr><tr><td>Income (loss) from discontinued operations, net of tax</td><td>$</td><td>0</td><td>$-16,180</td><td>$4,684</td></tr></table>
<table><tr><td></td><td>One-Percentage-PointIncrease</td><td>One-Percentage-PointDecrease</td></tr><tr><td>Effect on total of service and interest cost components</td><td>$7,367</td><td>$-5,974</td></tr><tr><td>Effect on other postretirement benefit obligation</td><td>$72,238</td><td>$-60,261</td></tr></table>
<table><tr><td></td><td colspan="6">December 31,</td></tr><tr><td></td><td colspan="2">2014</td><td colspan="2">2013</td><td colspan="2">2012</td></tr><tr><td></td><td>Water</td><td>Wastewater</td><td>Water</td><td>Wastewater</td><td>Water</td><td>Wastewater</td></tr><tr><td>Residential</td><td>2,813,715</td><td>117,602</td><td>2,813,601</td><td>117,584</td><td>2,783,354</td><td>95,576</td></tr><tr><td>Commercial</td><td>218,314</td><td>6,221</td><td>219,510</td><td>6,287</td><td>218,988</td><td>5,477</td></tr><tr><td>Industrial</td><td>3,793</td><td>17</td><td>3,822</td><td>16</td><td>3,894</td><td>12</td></tr><tr><td>Public & other</td><td>59,249</td><td>281</td><td>58,420</td><td>259</td><td>50,702</td><td>223</td></tr><tr><td>Total</td><td>3,095,071</td><td>124,121</td><td>3,095,353</td><td>124,146</td><td>3,056,938</td><td>101,288</td></tr></table>

Question: What's the difference of Operating revenues between 2012 and 2011?