Other non-operating results
The following details our other consolidated results for the years ended December 31, 2019 and 2018:
Interest expense: Interest expense increased by $1.2 million to $103.1 million for the year ended December 31, 2019 compared to $101.9 million for the same period in 2018. The increase in interest expense was primarily due to:
• $28.9 million lower capitalized interest on borrowing costs in relation to our investment in the Hilli FLNG conversion following acceptance of the vessel by the charterer in May 2018; and
• $1.5 million interest on the term loan facility, drawn in September 2019.
This was partially offset by reduced interest costs due to lower LIBOR rates, resulting in:
• $12.4 million decrease in interest expense arising on the loan facilities of our consolidated lessor VIEs;
• $8.7 million capitalized interest on borrowing costs in relation to our investments;
• $6.5 million decrease in interest expense incurred on the deposits received from Golar Partners following application of the deposit to the Hilli acquisition price and the conversion of the Hilli shareholder loans to equity following the Hilli Disposal in July 2018; and
• $1.0 million decrease in interest expense on the Hilli letter of credit, due to a contractual step down in the Hilli letter of credit from $300 million to $250 million in May 2019, and a further step down to $125 million in November 2019.
Losses on derivative instruments: Losses on derivative instruments increased by $7.5 million to a loss of $38.0 million for the year ended December 31, 2019 compared to a loss of $30.5 million for the same period in 2018. The movement was primarily due to:
Net unrealized and realized (losses)/gains on interest rate swap agreements: As of December 31, 2019, we have an interest rate swap portfolio with a notional amount of $737.5 million, none of which are designated as hedges for accounting purposes. Net unrealized losses on the interest rate swaps increased to a loss of $16.5 million for the year ended December 31, 2019 compared to a gain of $0.6 million for the same period in 2018, due to a decline in the long-term swap rates, partially offset by the decreased notional value of our swap portfolio over the period. Realized gains on our interest rate swaps decreased to a gain of $6.4 million for the year ended December 31, 2019, compared to a gain of $8.1 million for the same period in 2018. The decrease was primarily due to lower LIBOR rates for the year ended December 31, 2019.
Unrealized losses on Total Return Swap: In December 2014, we established a three month facility for a Stock Indexed Total Return Swap Programme or Equity Swap Line with DNB Bank ASA in connection with a share buyback scheme. In November 2019, we repurchased 1.5 million shares underlying the equity swap. The remaining facility has been extended to March 2020. The equity swap derivatives mark-to-market adjustment resulted in a net loss of $30.5 million recognized in the year ended December 31, 2019 compared to a loss of $30.7 million for the same period in 2018. The losses in 2019 and 2018 are due to the decline in our share price.
Unrealized mark-to-market losses on Earn-Out Units: This relates to the mark-to-market movement on the Earn-Out Units issuable in connection with the IDR reset transaction in October 2016, which we recognize as a derivative asset in our consolidated financial statements. The decrease in Golar Partners' quarterly distribution to $0.4042 per common unit on October 24, 2018 resulted in the contingent Earn-Out Units arising out of the IDR reset transaction in October 2016 not crystallizing and, accordingly, we recognized a mark-to-market loss of $7.4 million for the year ended December 31, 2018, effectively reducing the derivative asset to $nil at December 31, 2018. There was no comparative movement for the year ended December 31, 2019.
Other financial items, net: Other financial items, net decreased by $4.0 million to a loss of $5.5 million for the year ended December 31, 2019 compared to $1.5 million for the same period in 2018 primarily as a result of consolidating our lessor VIEs.
Net income attributable to non-controlling interests: Net income attributable to non-controlling interests increased by $26.4 million to $89.6 million for the year ended December 31, 2019 compared to $63.2 million for the same period in 2018 mainly due to the completion of the Hilli Disposal in July 2018. The non-controlling interest in relation to the Hilli Disposal for the year ended December 31, 2019 amounted to $61.7 million, compared to $31.3 million for the same period in 2018.
The net income attributable to non-controlling interests comprises of: • $36.5 million and $19.7 million in relation to the non-controlling shareholders who hold interests in Hilli LLC for the year ended December 31, 2019 and 2018, respectively; • $0.5 million in relation to the non-controlling shareholders who hold interests in Gimi MS Corporation for the year ended December 31, 2019, following the subscription of 30% equity interest by First FLNG Holdings in April 2019; and • $28.3 million and $31.9 million in relation to the equity interests in our remaining lessor VIEs for the year ended December 31, 2019 and 2018, respectively.

December 31,
(in thousands of $)
2019
2018
Change
% Change
Interest income
10,479
10,133
346
3%
Interest expense
(103,124)
(101,908)
(1,216)
1%
Losses on derivative instruments
(38,044)
(30,541)
(7,503)
25%
Other financial items, net
(5,522)
(1,481)
(4,041)
100%
Income taxes
(1,024)
(1,267)
243
(19)%
Net income attributable to non-controlling interests
(89,581)
(63,214)
(26,367)
42%


Question: Analyse this data from a financial earnings document. What was the change in net unrealized losses on the interest rate swaps?
Choices:
-17.1
242.4
-33.6
-19.6
-15.9
Correct choice index: 0