Revenue Experience. The revenue experience in the following table is presented before deduction for write-offs. Revenues from Finance Charge Receivables on both a billed and a cash basis will be affected by numerous factors, including the periodic finance charge on the Account Assets, the amount of any annual or membership fees, other fees paid by cardholders, and the percentage of cardholders who pay off their balances in full each month and do not incur periodic finance charges on purchases. Revenue Experience for the Accounts (unaudited) Year Ended December 31, 2017 Year Ended December 31, 2016 Year Ended December 31, 2015 Revenue ................................ Interest Earned ................... $1,391,550,575 $1,410,388,040 $1,194,797,139 Fees .................................... $1,142,538,716 $1,138,674,999 $997,993,897 Average Pool Balance $11,182,952,439 $11,243,136,886 $9,714,398,562(1) Average Revenue Yield(2) ..... 22.66% 22.68% 22.57%
Revenue Experience. The revenue experience in the following table is presented before deduction for write-offs. Revenues from Finance Charge Receivables on both a billed and a cash basis will be affected by numerous factors, including the periodic finance charge on the Account Assets, the amount of any annual or membership fees, other fees paid by cardholders, and the percentage of cardholders who pay off their balances in full each month and do not incur periodic finance charges on purchases. Revenue Experience for the Accounts (unaudited) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 Year Ended December 31, 2016 Revenue................................... Interest Earned ..................... $1,029,969,440 $1,398,096,791 $1,391,550,575 $1,410,388,040 Fees ...................................... $828,130,520 $1,148,537,436 $1,142,538,716 $1,138,674,999 Average Pool Balance(1) $10,819,795,542 $11,104,635,225 $11,182,952,439 $11,243,136,886 Average Revenue Yield(2) ....... 22.90% 22.93% 22.66% 22.68%
Revenue Experience. The revenue experience in the following table is presented before deduction for write-offs. Revenues from Finance Charge Receivables on both a billed and a cash basis will be affected by numerous factors, including the periodic finance charge on the Account Assets, the amount of any annual or membership fees, other fees paid by cardholders, and the percentage of cardholders who pay off their balances in full each month and do not incur periodic finance charges on purchases. Revenue Experience for the Accounts (unaudited) Six Months Ended June 30, 2020 Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017
Revenue Experience. The revenue experience in the following table is presented before deduction for write-offs. Revenues from Finance Charge Receivables on both a billed and a cash basis will be affected by numerous factors, including the periodic finance charge on the Account Assets, the amount of any annual or membership fees, other fees paid by cardholders, and the percentage of cardholders who pay off their balances in full each month and do not incur periodic finance charges on purchases. Revenue Experience for the Accounts (unaudited) Year Ended December 31, 2021 Year Ended December 31, 2020 Year Ended December 31, 2019 Revenue ................................... Interest Earned ..................... $1,151,466,012 $1,300,767,251(1) $1,371,624,313 Fees ...................................... $1,169,691,425 $1,034,171,990 $1,120,847,676 Average Pool Balance ............. $9,343,327,820 $9,935,627,017(2) $10,800,808,684 Average Revenue Yield(3) ....... 24.85% 23.52% 23.08% (1) The Seller had a program under which eligible credit card obligors were provided with credits to their credit card account to reimburse them for 50% of the interest charged to their credit card account (“COVID-19 Hardship Interest Charge Credits”). The COVID-19 Hardship Interest Charge Credits have been included as Finance Charge Receivables.
