Years Ended December 31,
2019
2018
Increase / (Decrease)
Net revenue
$39.0
$20.7
$18.3
Cost of revenue
17.1
11.2
5.9
Selling, general and administrative
4.9
4.0
0.9
Depreciation and amortization
6.9
5.5
1.4
Other operating expense
—
0.5
(0.5)
Income (loss) from operations
10.1
$(0.5)
$10.6

text: Energy Segment
text: Segment Results of Operations In the Company's Consolidated Financial Statements, other operating (income) expense includes (i) (gain) loss on sale or disposal of assets, (ii) lease termination costs, (iii) asset impairment expense, (iv) accretion of asset retirement obligations, and (v) FCC reimbursements. Each table summarizes the results of operations of our operating segments and compares the amount of the change between the periods presented (in millions).
text: Net revenue: Net revenue from our Energy segment for the year ended December 31, 2019 increased $18.3 million to $39.0 million from $20.7 million for the year ended December 31, 2018. The increase was primarily driven by the AFTC related to the 2018 and 2019 CNG sales that was recognized in the fourth quarter of 2019, inclusive of prior period AFTC at the acquired ampCNG stations which was also recognized in 2019. The increase was also driven by higher volume-related revenues from the recent acquisition of the ampCNG stations and growth in CNG sales volumes.
text: Cost of revenue: Cost of revenue from our Energy segment for the year ended December 31, 2019 increased $5.9 million to $17.1 million from $11.2 million for the year ended December 31, 2018. The increase was due to overall growth in volumes of gasoline gallons delivered and higher commodity and utility costs driven by the acquisition of ampCNG stations.
text: Selling, general and administrative: Selling, general and administrative expenses from our Energy segment for the year ended December 31, 2019 increased $0.9 million to $4.9 million from $4.0 million for the year ended December 31, 2018. The increase was driven by an increase in salaries and benefits largely due to the of the acquisition of ampCNG stations, which were acquired late in the second quarter of 2019, partially offset by a one-time expense in the prior year related to the abandonment of a station development project.
text: Depreciation and amortization from our Energy segment for the year ended December 31, 2019 increased $1.4 million to $6.9 million from $5.5 million for the year ended December 31, 2018. The increase was due to additional depreciation and amortization from the recent acquisition of ampCNG stations.
text: Other operating expense from our Energy segment was a loss of $0.5 million for the year ended December 31, 2018, driven by impairment of certain stations during the fourth quarter of 2018.

Questions:
question: What was the net revenue for the year ended December 31, 2019?
answer: $39.0 million
question: What was the net revenue for the year ended December 31, 2018?
answer: $20.7 million
question: What was the cost of revenue for the year ended December 31, 2019?
answer: $17.1 million
question: What was the percentage change in the net revenue from 2018 to 2019?
answer: 88.41
derivation: 39.0 / 20.7 - 1
scale: percent
question: What was the average cost of revenue for 2018 and 2019?
answer: 14.15
derivation: (17.1 + 11.2) / 2
scale: million
question: What is the percentage change in the Depreciation and amortization from 2018 to 2019?
answer: 25.45
derivation: 6.9 / 5.5 - 1
scale: percent