Please answer the given financial question based on the context.
Context: eog resources , inc . supplemental information to consolidated financial statements ( continued ) capitalized costs relating to oil and gas producing activities . the following table sets forth the capitalized costs relating to eog's crude oil and natural gas producing activities at december 31 , 2017 and 2016: .
||2017|2016|
|proved properties|$ 48845672|$ 45751965|
|unproved properties|3710069|3840126|
|total|52555741|49592091|
|accumulated depreciation depletion and amortization|-29191247 ( 29191247 )|-26247062 ( 26247062 )|
|net capitalized costs|$ 23364494|$ 23345029|
costs incurred in oil and gas property acquisition , exploration and development activities . the acquisition , exploration and development costs disclosed in the following tables are in accordance with definitions in the extractive industries - oil and a gas topic of the accounting standards codification ( asc ) . acquisition costs include costs incurred to purchase , lease or otherwise acquire property . exploration costs include additions to exploratory wells , including those in progress , and exploration expenses . development costs include additions to production facilities and equipment and additions to development wells , including those in progress. .
Question: what are the average cost of accumulated depreciation depletion and amortization for 2016 and 2017?


Answer: The answer is:-27719154.5