Stock Performance Graph The following graph sets forth the cumulative total shareholder return on our Series A common stock, Series B common stock and Series C common stock as compared with the cumulative total return of the companies listed in the Standard and Poor’s 500 Stock Index (“S&P 500 Index”) and a peer group of companies comprised of CBS Corporation Class B common stock, News Corporation Class A common stock, Scripps Network Interactive, Inc. , Time Warner, Inc. , Viacom, Inc.  Class B common stock and The Walt Disney Company.
The graph assumes $100 originally invested on September 18, 2008, the date upon which our common stock began trading, in each of our Series A common stock, Series B common stock and Series C common stock, the S&P 500 Index, and the stock of our peer group companies, including reinvestment of dividends, for the period September 18, 2008 through December 31, 2008 and the years ended December 31, 2009, 2010, 2011, and 2012.
## Table 0 ##
Equity Compensation Plan Information Information regarding securities authorized for issuance under equity compensation plans will be set forth in our definitive Proxy Statement for our 2013 Annual Meeting of Stockholders under the caption “Securities Authorized for Issuance Under Equity Compensation Plans,” which is incorporated herein by reference.
Proved Gas Reserves (Unaudited) The following reserve schedule was developed by our reserve engineers and sets forth the changes in estimated quantities of proved natural gas reserves:
## Table 1 ##
(1) Other International includes the North Sea, China and Argentina.
We sold our assets in Argentina in 2008.
(2) West Africa’s positive revisions are primarily due to additional production allowances related to LNG sales.
Positive revisions in Ecuador are related to better than expected well performance.
(3) The increase in US proved reserves includes 140 Bcf in the Wattenberg field, 77 Bcf in the Piceance basin and 55 Bcf in the Mid-continent area, primarily due to infill drilling activities.
(4) Purchase of minerals in place includes 128 Bcf acquired in the purchase of U. S.  Exploration.
See Note 4—Acquisitions and Divestitures.
(5) Sale of minerals in place is primarily due to sale of Gulf of Mexico shelf properties.
See Note 4—Acquisitions and Divestitures.
(6) The negative revisions within the US are primarily due to 103 Bcf of natural gas being reflected in the proved oil reserves table as NGLs, partially offset by positive revisions resulting from an increase in commodity price.
West Africa’s positive revisions are primarily due to additional production allowances related to LNG sales.
Positive revisions in Ecuador are related to better than expected well performance.
(7) The increase in US proved reserves includes 142 Bcf in the Wattenberg field, 83 Bcf in the Piceance basin and 19 Bcf in the Niobrara trend, primarily due to infill drilling activities.
(8) Negative revisions in the US are primarily due to lower year-end prices (109 Bcf), as well as additional natural gas volumes being reflected in the proved oil reserves table as NGLs.
West Africa’s positive revisions are primarily due to additional production allowances related to LNG sales.
(9) The increase in US proved reserves includes 106 Bcf in the Wattenberg field and 173 Bcf in the Rockies, primarily from the Piceance basin and Niobrara trend primarily due to infill drilling activities.
The remaining increase is due to other development programs in the US Northern and Southern regions.
(10) Purchase of minerals in place is primarily due to the Mid-continent acquisition.
See Note 4—Acquisitions and Divestitures.
Items 1 and 2.  Business and Properties This Annual Report on Form 10-K and the documents incorporated herein by reference contain forward-looking statements based on expectations, estimates and projections as of the date of this filing.
These statements by their nature are subject to risks, uncertainties and assumptions and are influenced by various factors.
As a consequence, actual results may differ materially from those expressed in the forward-looking statements.
For more information, see Item 1A.
Risk Factors—Disclosure Regarding Forward-Looking Statements of this Form 10-K.  General Noble Energy, Inc.  (Noble Energy, we or us) is a Delaware corporation, formed in 1969, that has been publicly traded on the New York Stock Exchange (NYSE) since 1980.
We are an independent energy company that has been engaged in the acquisition, exploration, development, production and marketing of crude oil, natural gas, and natural gas liquids (NGLs) since 1932.
In this report, unless otherwise indicated or where the context otherwise requires, information includes that of Noble Energy and its subsidiaries.
We operate primarily in the Rocky Mountains, Midcontinent, and deepwater Gulf of Mexico areas in the US, with key international operations offshore Israel, the North Sea and West Africa.
Strategy Our strategy is to achieve growth in earnings and cash flow through the development of a high quality portfolio of producing assets that is balanced between US and international projects.
Strategic acquisitions of Patina Oil & Gas Corporation (Patina) in 2005 and U. S.  Exploration Holdings, Inc.  (U. S.  Exploration) in 2006, along with additional capital investment in US and international locations, have resulted in substantial growth in the last several years.
Acquisitions and capital investment, combined with the sale of non-core assets, have allowed us to achieve a strategic objective of enhancing our US asset portfolio, resulting in a company with assets and capabilities that include growing US basins coupled with a significant portfolio of international properties.
See Item 6.
Selected Financial Data for additional financial and operating information for fiscal years 2004-2008.
Proved Reserves Proved reserves estimates at December 31, 2008 were as follows:
## Table 2 ##
(1) Natural gas is converted on the basis of six Mcf of gas per one barrel of oil equivalent.
(2) Approximately 69% are proved developed reserves.
Estimates of Proved Reserves – Proved oil and gas reserves are the estimated quantities of crude oil, natural gas and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions (i. e. , prices and costs as of the date the estimate is made).
Prices include consideration of changes in existing prices provided only by contractual arrangements, but not on escalations based upon future conditions.
For additional information regarding estimates of crude oil and natural gas reserves, including estimates of proved and proved developed reserves, the standardized measure of discounted future net cash flows, and the changes in discounted future net cash flows, see Item 7.
Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting

<table><tr><td></td><td>December 31,2008</td><td>December 31,2009</td><td>December 31,2010</td><td>December 31,2011</td><td>December 31,2012</td></tr><tr><td>DISCA</td><td>$102.53</td><td>$222.09</td><td>$301.96</td><td>$296.67</td><td>$459.67</td></tr><tr><td>DISCB</td><td>$78.53</td><td>$162.82</td><td>$225.95</td><td>$217.56</td><td>$327.11</td></tr><tr><td>DISCK</td><td>$83.69</td><td>$165.75</td><td>$229.31</td><td>$235.63</td><td>$365.63</td></tr><tr><td>S&P 500</td><td>$74.86</td><td>$92.42</td><td>$104.24</td><td>$104.23</td><td>$118.21</td></tr><tr><td>Peer Group</td><td>$68.79</td><td>$100.70</td><td>$121.35</td><td>$138.19</td><td>$190.58</td></tr></table>
<table><tr><td></td><td></td><td colspan="5">Natural Gas and Casinghead Gas (Bcf)</td></tr><tr><td></td><td>United States</td><td>West Africa</td><td>Israel</td><td>Ecuador</td><td>Other Int'l -1</td><td>Total</td></tr><tr><td>Proved reserves as of:</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>December 31, 2005</td><td>1,641</td><td>901</td><td>394</td><td>144</td><td>11</td><td>3,091</td></tr><tr><td>Revisions of previous estimates-2</td><td>-83</td><td>58</td><td>-</td><td>33</td><td>11</td><td>19</td></tr><tr><td>Extensions, discoveries and other additions-3</td><td>314</td><td>-</td><td>-</td><td>-</td><td>-</td><td>314</td></tr><tr><td>Purchase of minerals in place-4</td><td>141</td><td>3</td><td>-</td><td>-</td><td>-</td><td>144</td></tr><tr><td>Sale of minerals in place-5</td><td>-110</td><td>-</td><td>-</td><td>-</td><td>-</td><td>-110</td></tr><tr><td>Production</td><td>-164</td><td>-17</td><td>-34</td><td>-9</td><td>-3</td><td>-227</td></tr><tr><td>December 31, 2006</td><td>1,739</td><td>945</td><td>360</td><td>168</td><td>19</td><td>3,231</td></tr><tr><td>Revisions of previous estimates-6</td><td>-67</td><td>44</td><td>-</td><td>29</td><td>-1</td><td>5</td></tr><tr><td>Extensions, discoveries and other additions-7</td><td>316</td><td>-</td><td>-</td><td>-</td><td>3</td><td>319</td></tr><tr><td>Purchase of minerals in place</td><td>3</td><td>-</td><td>-</td><td>-</td><td>-</td><td>3</td></tr><tr><td>Sale of minerals in place</td><td>-</td><td>-</td><td>-</td><td>-</td><td>-</td><td>-</td></tr><tr><td>Production</td><td>-151</td><td>-48</td><td>-41</td><td>-9</td><td>-2</td><td>-251</td></tr><tr><td>December 31, 2007</td><td>1,840</td><td>941</td><td>319</td><td>188</td><td>19</td><td>3,307</td></tr><tr><td>Revisions of previous estimates-8</td><td>-253</td><td>34</td><td>1</td><td>-</td><td>8</td><td>-210</td></tr><tr><td>Extensions, discoveries and other additions-9</td><td>345</td><td>78</td><td>4</td><td>-</td><td>-</td><td>427</td></tr><tr><td>Purchase of minerals in place-10</td><td>72</td><td>-</td><td>-</td><td>-</td><td>-</td><td>72</td></tr><tr><td>Sale of minerals in place</td><td>-</td><td>-</td><td>-</td><td>-</td><td>-</td><td>-</td></tr><tr><td>Production</td><td>-145</td><td>-75</td><td>-51</td><td>-8</td><td>-2</td><td>-281</td></tr><tr><td>December 31, 2008</td><td>1,859</td><td>978</td><td>273</td><td>180</td><td>25</td><td>3,315</td></tr><tr><td>Proved developed reserves as of:</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>December 31, 2005</td><td>1,279</td><td>431</td><td>337</td><td>144</td><td>11</td><td>2,202</td></tr><tr><td>December 31, 2006</td><td>1,255</td><td>360</td><td>303</td><td>168</td><td>19</td><td>2,105</td></tr><tr><td>December 31, 2007</td><td>1,259</td><td>830</td><td>263</td><td>188</td><td>16</td><td>2,556</td></tr><tr><td>December 31, 2008</td><td>1,268</td><td>700</td><td>216</td><td>180</td><td>21</td><td>2,385</td></tr></table>
<table><tr><td></td><td colspan="3">December 31, 2008</td></tr><tr><td></td><td>Proved Developed Reserves</td><td>Proved Undeveloped Reserves</td><td>Total Proved Reserves</td></tr><tr><td>United States</td><td></td><td></td><td></td></tr><tr><td>Crude oil, condensate and NGLs (MMBbls)</td><td>121</td><td>77</td><td>198</td></tr><tr><td>Natural gas (Bcf)</td><td>1,268</td><td>591</td><td>1,859</td></tr><tr><td>Total US (MMBoe)(1)</td><td>332</td><td>176</td><td>508</td></tr><tr><td>International</td><td></td><td></td><td></td></tr><tr><td>Crude oil, condensate and NGLs (MMBbls)</td><td>78</td><td>35</td><td>113</td></tr><tr><td>Natural gas (Bcf)</td><td>1,117</td><td>339</td><td>1,456</td></tr><tr><td>Total International (MMBoe)(1)</td><td>264</td><td>92</td><td>356</td></tr><tr><td>Worldwide</td><td></td><td></td><td></td></tr><tr><td>Crude oil, condensate and NGLs (MMBbls)</td><td>199</td><td>112</td><td>311</td></tr><tr><td>Natural gas (Bcf)</td><td>2,385</td><td>930</td><td>3,315</td></tr><tr><td>Total Worldwide (MMBoe)(1) (2)</td><td>596</td><td>268</td><td>864</td></tr></table>

Question: what was the percentage cumulative total shareholder return on discb common stock from september 18 , 2008 to december 31 , 2012?
Answer: 2.2711