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.


devon energy corporation and subsidiaries notes to consolidated financial statements 2013 ( continued ) proved undeveloped reserves the following table presents the changes in devon 2019s total proved undeveloped reserves during 2013 ( in mmboe ) . . <table class='wikitable'><tr><td>1</td><td>-</td><td>u.s .</td><td>canada</td><td>total</td></tr><tr><td>2</td><td>proved undeveloped reserves as of december 31 2012</td><td>407</td><td>433</td><td>840</td></tr><tr><td>3</td><td>extensions and discoveries</td><td>57</td><td>38</td><td>95</td></tr><tr><td>4</td><td>revisions due to prices</td><td>1</td><td>-10 ( 10 )</td><td>-9 ( 9 )</td></tr><tr><td>5</td><td>revisions other than price</td><td>-91 ( 91 )</td><td>13</td><td>-78 ( 78 )</td></tr><tr><td>6</td><td>conversion to proved developed reserves</td><td>-116 ( 116 )</td><td>-31 ( 31 )</td><td>-147 ( 147 )</td></tr><tr><td>7</td><td>proved undeveloped reserves as of december 31 2013</td><td>258</td><td>443</td><td>701</td></tr></table> at december 31 , 2013 , devon had 701 mmboe of proved undeveloped reserves . this represents a 17 percent decrease as compared to 2012 and represents 24 percent of total proved reserves . drilling and development activities increased devon 2019s proved undeveloped reserves 95 mmboe and resulted in the conversion of 147 mmboe , or 18 percent , of the 2012 proved undeveloped reserves to proved developed reserves . costs incurred related to the development and conversion of devon 2019s proved undeveloped reserves were $ 1.9 billion for 2013 . additionally , revisions other than price decreased devon 2019s proved undeveloped reserves 78 mmboe primarily due to evaluations of certain u.s . onshore dry-gas areas , which devon does not expect to develop in the next five years . the largest revisions relate to the dry-gas areas in the cana-woodford shale in western oklahoma , carthage in east texas and the barnett shale in north texas . a significant amount of devon 2019s proved undeveloped reserves at the end of 2013 related to its jackfish operations . at december 31 , 2013 and 2012 , devon 2019s jackfish proved undeveloped reserves were 441 mmboe and 429 mmboe , respectively . development schedules for the jackfish reserves are primarily controlled by the need to keep the processing plants at their 35000 barrel daily facility capacity . processing plant capacity is controlled by factors such as total steam processing capacity , steam-oil ratios and air quality discharge permits . as a result , these reserves are classified as proved undeveloped for more than five years . currently , the development schedule for these reserves extends though the year 2031 . price revisions 2013 2013 reserves increased 94 mmboe primarily due to higher gas prices . of this increase , 43 mmboe related to the barnett shale and 19 mmboe related to the rocky mountain area . 2012 2013 reserves decreased 171 mmboe primarily due to lower gas prices . of this decrease , 100 mmboe related to the barnett shale and 25 mmboe related to the rocky mountain area . 2011 2013 reserves decreased 21 mmboe due to lower gas prices and higher oil prices . the higher oil prices increased devon 2019s canadian royalty burden , which reduced devon 2019s oil reserves . revisions other than price total revisions other than price for 2013 , 2012 and 2011 primarily related to devon 2019s evaluation of certain dry gas regions , with the largest revisions being made in the cana-woodford shale , barnett shale and carthage .
Question: combined, what was the total revisions due to prices and revisions other than price?
Answer: 87.0
Question: and the value of revisions other than price?
Answer: 78.0
Question: so what was the proportion of this value compared to the total?

0.89655