2019
2018
2017
Net derivative gains (losses) incurred
$(3.6)
$(0.9)
$0.6
Less: Net derivative gains (losses) allocated to reporting segments
(1.8)
(7.1)
5.7
Net derivative gains (losses) recognized in general corporate expenses
$(1.8)
$6.2
$(5.1)
Net derivative gains (losses) allocated to Grocery & Snacks
$(2.1)
$0.2
$3.4
Net derivative gains (losses) allocated to Refrigerated & Frozen
(1.1)
(0.3)
0.8
Net derivative gains (losses) allocated to International
2.8
(6.9)
1.6
Net derivative losses allocated to Foodservice
(0.6)
(0.1)
—
Net derivative losses allocated to Pinnacle Foods
(0.8)
—
—
Net derivative losses allocated to Commercial
—
—
(0.1)
Net derivative gains (losses) included in segment operating profit
$(1.8)
$(7.1)
$5.7

text: Presentation of Derivative Gains (Losses) for Economic Hedges of Forecasted Cash Flows in Segment Results
text: Derivatives used to manage commodity price risk and foreign currency risk are not designated for hedge accounting treatment. We believe these derivatives provide economic hedges of certain forecasted transactions. As such, these derivatives are recognized at fair market value with realized and unrealized gains and losses recognized in general corporate expenses. The gains and losses are subsequently recognized in the operating results of the reporting segments in the period in which the underlying transaction being economically hedged is included in earnings. In the event that management determines a particular derivative entered into as an economic hedge of a forecasted commodity purchase has ceased to function as an economic hedge, we cease recognizing further gains and losses on such derivatives in corporate expense and begin recognizing such gains and losses within segment operating results, immediately.
text: The following table presents the net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk of certain forecasted transactions, under this methodology:
text: As of May 26, 2019, the cumulative amount of net derivative gains from economic hedges that had been recognized in general corporate expenses and not yet allocated to reporting segments was $1.4 million. This amount reflected net gains of $1.0 million incurred during the fiscal year ended May 26, 2019, as well as net gains of $0.4 million incurred prior to fiscal 2019. Based on our forecasts of the timing of recognition of the underlying hedged items, we expect to reclassify to segment operating results gains of $0.9 million in fiscal 2020 and $0.5 million in fiscal 2021 and thereafter.
text: Notes to Consolidated Financial Statements - (Continued) Fiscal Years Ended May 26, 2019, May 27, 2018, and May 28, 2017 (columnar dollars in millions except per share amounts)

Questions:
question: What is the use of derivatives?
answer: manage commodity price risk
question: What does the table show us?
answer: the net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk of certain forecasted transactions
question: What were the net derivative losses allocated to Foodservice in 2018 and 2019, respectively?
answer: (0.6)
(0.1)
scale: million
question: What is the percentage change in net derivative gains (losses) included in segment operating profit in 2019 compared to 2017?
answer: -131.58
derivation: (-1.8-5.7)/5.7 
scale: percent
question: What is the average net derivative gains (losses) allocated to Grocery & Snacks from 2017 to 2019?
answer: 0.5
derivation: (-2.1+0.2+3.4)/3 
scale: million
question: What are the total net derivative losses allocated to Foodservice, Pinnacle Foods, as well as Commercial in 2019?
answer: -1.4
derivation: (-0.6)+(-0.8) 
scale: million