Table:
|  | Unaudited |  |  |  |
| --- | --- | --- | --- | --- |
|  | Three months ended |  |  |  |
|  | 31 December 2019 |  | 31 December 2018 |  |
|  |  | % of |  | % of |
|  |  | segment |  | segment |
|  | Amount | revenues | Amount | revenues |
|  |  |  | (Restated) | (Restated) |
|  | (RMB in millions, unless specified) |  |  |  |
| VAS | 26,120 | 50% | 20,330 | 47% |
| FinTech and Business Services | 21,520 | 72% | 16,310 | 76% |
| Online Advertising | 9,241 | 46% | 10,800 | 63% |
| Others | 2,778 | 84% | 2,304 | 88% |
| Total cost of revenues | 59,659 |  | 49,744 |  |
Paragraphs:
Cost of revenues. Cost of revenues increased by 20% to RMB59,659 million for the fourth quarter of 2019 on a year-on-year basis. The increase was mainly due to greater costs of FinTech services, channel costs and content costs. As a percentage of revenues, cost of revenues decreased to 56% for the fourth quarter of 2019 from 59% for the fourth quarter of 2018. The following table sets forth our cost of revenues by line of business for the fourth quarter of 2019 and the fourth quarter of 2018:
Cost of revenues for VAS increased by 28% to RMB26,120 million for the fourth quarter of 2019 on a year-on-year basis. The increase mainly reflected greater channel costs for smart phone games due to increased revenues, including the channel costs attributable to Supercell, as well as higher content costs for services and products such as live broadcast services, online games and music streaming.
Cost of revenues for FinTech and Business Services increased by 32% to RMB21,520 million for the fourth quarter of 2019 on a year-on-year basis. The increase was primarily driven by scale expansion of our payment-related services and cloud business.
Cost of revenues for Online Advertising decreased by 14% to RMB9,241 million for the fourth quarter of 2019 on a year-on-year basis. The decrease was mainly due to lower content costs for video advertising as a result of fewer major content releases, and to cost management.
Question:
What is the change in costs of Online Advertising revenue between the fourth quarter of 2018 and 2019?