28

Interest income

The breakdown of this item in the accompanying statement of profit or loss is as follows:

Breakdown of interest income (Millions of euros)

    2020 2019 2018
Credit institutions 35 47 31
Debt securities 1,950 2,101 1,993
Financial assets held for trading 0 7 13
Financial assets compulsorily measured at fair value through profit or loss 2 5 5
Financial assets at fair value with changes in other comprehensive income 1,812 1,966 1,856
Financial assets at amortised cost 136 123 119
Loans and advances to customers and other financial income 4,534 4,808 4,762
Public administrations 65 75 97
Trade credits and bills 150 175 176
Mortgage loans 1,778 1,921 2,018
Personal loans 2,109 2,089 1,910
Credit accounts 323 434 428
Other 109 114 133
Adjustments to income due to hedging transactions (129) (28) 5
Interest income - liabilities 374 127 155
TOTAL 6,764 7,055 6,946
Of which: interest on exposures in stage 3 152 196 293

The average effective interest rate of the various financial assets categories calculated on average net balances (excluding rectifications) are as follows:

Average return on assets (Percentage)

    2020 2019 2018
Deposits at central banks 0.00% 0.00% 0.00%
Financial assets held for trading – debt securities 0.02% 0.39% 0.64%
Financial assets compulsorily measured at fair value through profit or loss - Debt securities 6.23% 4.46% 3.61%
Financial assets measured at fair value with changes in other comprehensive income / Available-for-sale financial assets - Debt securities 2.33% 2.61% 2.71%
Financial assets at amortised cost
Loans and advances to credit institutions 0.78% 1.07% 0.64%
Loans and advances to customers 2.02% 2.25% 2.28%
Debt securities 0.56% 0.68% 0.70%