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System Fund | 12 Months Ended
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Dec. 31, 2021
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System Fund | 33. System Fund System Fund revenues comprise:
|  |  |  | 2021 $m |  |  |  |  | 2020 $m |  |  |  |  | 2019 $m
Assessment fees and contributions received from hotels |  |  |  | 727 |  |  |  |  |  |  | 490 |  |  |  |  | 1,036
Loyalty programme revenues, net of the cost of point redemptions |  |  |  | 201 |  |  |  |  |  |  | 275 |  |  |  |  | 337
|  |  |  | 928 |  |  |  |  |  |  | 765 |  |  |  |  | 1,373
System Fund expenses include:
|  |  |  | 2021 $m |  |  |  |  | 2020 $m |  |  |  |  | 2019 $m
Marketing |  |  |  | 147 |  |  |  |  |  |  | 109 |  |  |  |  | 461
Payroll costs (note 4) |  |  |  | 304 |  |  |  |  |  |  | 242 |  |  |  |  | 313
Depreciation and amortisation |  |  |  | 94 |  |  |  |  |  |  | 62 |  |  |  |  | 54
Impairment (reversal)/loss on financial assets (note 18) |  |  |  | (6) |  |  |  |  |  |  | 24 |  |  |  |  | 12
Other impairment (reversals)/charges |  |  |  | (3) |  |  |  |  |  |  | 41 |  |  |  |  | –

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