AMERICAN EXPRESS CO 10-K form for the fiscal year ended 2023-12-31, page 45: 
CONSOLIDATED RESULTS OF OPERATIONS


The discussions in the "Consolidated Results of Operations" and "Business Segment Results of Operations" provide commentary on the variances for the year ended December 31, 2023 compared to the year ended December 31, 2022, as presented in the accompanying tables. For a discussion of the financial condition and results of operations for 2022 compared to 2021, please refer to Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 10, 2023. 


TABLE 2: TOTAL REVENUES NET OF INTEREST EXPENSE SUMMARY 
|    |                                             |        |        |      |        |      |        |               |               |        |    |       |       |       |    |    |    |    |        |    |    |
|---:|:--------------------------------------------|:-------|:-------|:-----|:-------|:-----|:-------|:--------------|:--------------|:-------|:---|:------|:------|:------|:---|:---|:---|:---|:-------|:---|:---|
|  1 | Years Ended December 31,                    |        |        |      |        |      |        | Change        | Change        |        |    |       |       |       |    |    |    |    |        |    |    |
|  2 | (Millions, except percentages)              | 2023   |        | 2022 |        | 2021 |        | 2023 vs. 2022 | 2022 vs. 2021 |        |    |       |       |       |    |    |    |    |        |    |    |
|  3 | Discount revenue                            | $      | 33,416 |      |        | $    | 30,739 |               | $             | 24,563 | $  | 2,677 |       |       | 9  | %  |    | $  | 6,176  | 25 | %  |
|  4 | Net card fees                               | 7,255  |        |      | 6,070  |      |        | 5,195         |               | 1,185  | 20 |       |       | 875   |    |    | 17 |    |        |    |    |
|  5 | Service fees and other revenue              | 5,005  |        |      | 4,521  |      |        | 3,316         |               | 484    | 11 |       |       | 1,205 |    |    | 36 |    |        |    |    |
|  6 | Processed revenue                           | 1,705  |        |      | 1,637  |      |        | 1,556         |               | 68     | 4  |       |       | 81    |    |    | 5  |    |        |    |    |
|  7 | Total non-interest revenues                 | 47,381 |        |      | 42,967 |      |        | 34,630        |               | 4,414  | 10 |       |       | 8,337 |    |    | 24 |    |        |    |    |
|  8 | Total interest income                       | 19,983 |        |      | 12,658 |      |        | 9,033         |               | 7,325  | 58 |       |       | 3,625 |    |    | 40 |    |        |    |    |
|  9 | Total interest expense                      | 6,849  |        |      | 2,763  |      |        | 1,283         |               | 4,086  | #  |       | 1,480 |       |    | #  |    |    |        |    |    |
| 10 | Net interest income                         | 13,134 |        |      | 9,895  |      |        | 7,750         |               | 3,239  | 33 |       |       | 2,145 |    |    | 28 |    |        |    |    |
| 11 | Total revenues net of interest expense      | $      | 60,515 |      |        | $    | 52,862 |               | $             | 42,380 | $  | 7,653 |       |       | 14 | %  |    | $  | 10,482 | 25 | %  |
| 12 | # Denotes a variance of 100 percent or more |        |        |      |        |      |        |               |               |        |    |       |       |       |    |    |    |    |        |    |    |

TOTAL REVENUES NET OF INTEREST EXPENSE

Discount revenue increased, primarily driven by an increase in billed business of 9 percent. See Tables 5 and 6 for more details on billed business performance.
Net card fees increased, primarily driven by growth in our premium card portfolios. See Table 5 for more details on proprietary cards-in-force and average fee per card.
Service fees and other revenue increased, primarily driven by foreign exchange related revenues associated with Card Member cross-currency spending and growth in delinquency fees.
Processed revenue increased, primarily driven by an increase in network partner volumes, partially offset by a decrease in volumes associated with the decommission of one of our alternative payment solutions. See Tables 5 and 6 for more details on processed volume performance.
Interest income increased, primarily driven by higher interest rates and growth in revolving loan balances.
Interest expense increased, primarily driven by higher interest rates paid on customer deposits.
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Question: What is the trend in Discount Revenue for American Express between fiscal years 2021 and 2023?
Answer: Discount Revenue Trend:
2021: $24,563 million
2022: $30,739 million (25.1% increase)
2023: $33,416 million (8.7% increase)