| guarantee quality in the nine months ended September 30, 2017 compared to the corresponding period of 2016; and |
| • | | an increase in net gain onavailable-for-sale financial assets toW869.3 billion in the nine months ended September 30, 2017 fromW252.2 billion in the corresponding period of 2016, primarily due to gains from the sale of our equity interest in Korea Aerospace Industries, Ltd. in June 2017. |
The above factors were partially offset by (i) a decrease in dividend income toW784.9 billion in the nine months ended September 30, 2017 fromW1,117.9 billion in the corresponding period of 2016, primarily due to decreased dividends from investments in associates (including Korea Electric Power Corporation) and (ii) an increase in income tax expense toW444.7 billion in the nine months ended September 30, 2017 fromW68.0 billion in the corresponding period of 2016, primarily due to income before income tax ofW1,707.5 billion in the nine months ended September 30, 2017 compared to loss before income tax ofW583.1 billion in the corresponding period of 2016.
Loans to Financially Troubled Companies
We have credit exposure (including loans, guarantees and equity investments) to a number of financially troubled Korean companies including DSME, STX Offshore & Shipbuilding, Dongbu Steel Co., Ltd. Hanjin Heavy Industries and Construction Co., Ltd., Hyundai Merchant Marine Co., Ltd., Daehan Shipbuilding Co., Ltd., Hanjin Shipping Co., Ltd. and STX Heavy Industries Co., Ltd. As of September 30, 2017, our credit extended to these companies totaledW10,852.9 billion, accounting for 5.0% of our total assets as of such date.
As of September 30, 2017, our exposure (including loans classified as substandard or below and equity investment classified as estimated loss or below) to DSME decreased toW4,846.3 billion fromW7,634.4 billion as of December 31, 2016, primarily due to adebt-to-equity swap and impairment of DSME shares. As of September 30, 2017, our exposure to STX Offshore & Shipbuilding wasW1,050.2 billion, a decrease fromW1,422.8 billion as of December 31, 2016, primarily due to a decrease in guarantees. As of September 30, 2017, our exposure to Dongbu Steel decreased slightly toW1,299.7 billion fromW1,325.2 billion as of December 31, 2016, primarily due to the repayment of certain existing loans. As of September 30, 2017, our exposure to Hanjin Heavy Industries and Construction decreased toW1,202.9 billion fromW1,242.2 billion as of December 31, 2016, primarily due to the repayment of certain existing loans through the sale of collateral. As of September 30, 2017, our exposure to Hyundai Merchant Marine decreased toW1,052.0 billion fromW1,080.4 billion as of December 31, 2016, primarily due to the repayment of certain existing loans. As of September 30, 2017, our exposure to Daehan Shipbuilding decreased toW717.9 billion fromW769.2 billion as of December 31, 2016, primarily due to a decrease in guarantees. As of September 30, 2017, our exposure to Hanjin Shipping decreased toW380.3 billion fromW439.5 billion as of December 31, 2016, primarily due to the repayment of certain existing loans through the sale of collateral. As of September 30, 2017, our exposure to STX Heavy Industries increased toW303.2 billion fromW268.7 billion as of December 31, 2016, primarily due to an increase in valuation of shares of common stock of STX Heavy Industries.
As of September 30, 2017, we established provisions ofW924.7 billion for our exposure to DSME,W887.4 billion for STX Offshore & Shipbuilding,W195.2 billion for Dongbu Steel,W143.4 billion for Hanjin Heavy Industries and Construction,W180.5 billion for Hyundai Merchant Marine,W49.3 billion for Daehan Shipbuilding,W141.0 billion for Hanjin Shipping andW116.4 billion for STX Heavy Industries.
In the event that the financial condition of these companies or other large corporations to which we extended credits deteriorate in the future, we may be required to record additional provisions for credit losses, as well as charge-offs and valuation or impairment losses or losses on disposal, which may have a material adverse effect on our financial condition and results of operations.
For the nine months ended September 30, 2017, we soldnon-performing loans worthW307.6 billion to Eugene Asset Management and UAMCO Ltd.
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