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 ) . .

u.s .: proved undeveloped reserves as of december 31 2012: 407
extensions and discoveries: 57
revisions due to prices: 1
revisions other than price: -91
conversion to proved developed reserves: -116
proved undeveloped reserves as of december 31 2013: 258
canada: proved undeveloped reserves as of december 31 2012: 433
extensions and discoveries: 38
revisions due to prices: -10
revisions other than price: 13
conversion to proved developed reserves: -31
proved undeveloped reserves as of december 31 2013: 443
total: proved undeveloped reserves as of december 31 2012: 840
extensions and discoveries: 95
revisions due to prices: -9
revisions other than price: -78
conversion to proved developed reserves: -147
proved undeveloped reserves as of december 31 2013: 701

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 .

Questions:
what is the balance of proved undeveloped reserves in 2012 in us?
what about int 2013?
what is the net change?
what fraction change does this represent?
what about percentage change?

Answers:
407
258
149
0.3661
36.61%