Year Ended December 31, 2019 $
Year Ended December 31, 2018 $
Realized (losses) gains relating to:
Interest rate swap agreements
(8,296)
(13,898)
Interest rate swap agreement terminations
—
(13,681)
Foreign currency forward contracts
(147)
—
Stock purchase warrants
(25,559)
—
Forward freight agreements
1,490
137
(32,512)
(27,442)
Unrealized (losses) gains relating to:
Interest rate swap agreements
(7,878)
33,700
Foreign currency forward contracts
(200)
—
Stock purchase warrants
26,900
(21,053)
Forward freight agreements
(29)
(57)
18,793
12,590
Total realized and unrealized losses on derivative instruments
(13,719)
(14,852)

text: Realized and unrealized (losses) gains on non-designated derivative instruments. Realized and unrealized (losses) gains related to derivative instruments that are not designated as hedges for accounting purposes are included as a separate line item in the consolidated statements of loss. Net realized and unrealized losses on non-designated derivatives were $13.7 million for 2019, compared to $14.9 million for 2018, as detailed in the table below:
text: The realized losses relate to amounts we actually realized for settlements related to these derivative instruments in normal course and amounts paid to terminate interest rate swap agreement terminations.
text: During 2019 and 2018, we had interest rate swap agreements with aggregate average net outstanding notional amounts of approximately $1.1 billion and $1.3 billion, respectively, with average fixed rates of approximately 3.0% and 2.9%, respectively. Short-term variable benchmark interest rates during these periods were generally less than 3.0% and, as such, we incurred realized losses of $8.3 million and $13.9 million during 2019 and 2018, respectively, under the interest rate swap agreements.
text: We did not incur any realized losses related to the termination of interest rate swaps in 2019, compared to realized losses of $13.7 million during 2018. Primarily as a result of significant changes in long-term benchmark interest rates during 2019 and 2018, we recognized unrealized losses of $7.9 million in 2019 compared to unrealized gains of $33.7 million in 2018 under the interest rate swap agreements.
text: During the year ended December 31, 2019, we recognized a reversal of previously unrealized losses of $26.9 million on all the warrants held by Teekay to purchase common units of Altera (or the Warrants) as a result of the sale of the Warrants to Brookfield, and we concurrently recognized a realized loss of $25.6 million during the same period. During the year ended December 31, 2018, we recognized unrealized losses of $21.1 million on the Warrants. Please read “Item 18 – Financial Statements: Note 12 – Fair Value Measurements and Financial Instruments.”

Questions:
question: What was the Net realized and unrealized losses on non-designated derivatives in 2019?
answer: $13.7 million
question: What was the Net realized and unrealized losses on non-designated derivatives in 2018?
answer: $14.9 million
question: How much was the interest rate swap agreements with aggregate average net outstanding notional amounts during 2019 and 2018 respectively?
answer: $1.1 billion
$1.3 billion
question: What is the change in Realized (losses) gains relating to Interest rate swap agreements from Year Ended December 31, 2019 to December 31, 2018?
answer: -5602
derivation: 8,296-13,898
scale: thousand
question: What is the change in Realized (losses) gains relating to Forward freight agreements from Year Ended December 31, 2019 to December 31, 2018?
answer: 1353
derivation: 1,490-137
scale: thousand
question: What is the change in Unrealized (losses) gains relating to Interest rate swap agreements from Year Ended December 31, 2019 to December 31, 2018?
answer: -41578
derivation: -7,878-33,700
scale: thousand