Table:
|  | € million | € million | € million |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
|  |  | (Restated)(a) | (Restated)(a) |
| Operating profit | 8,708 | 12,639 | 8,957 |
| Non-underlying items within |  |  |  |
| operating profit (see note 3) | 1,239 | (3,176) | 543 |
| Underlying operating profit | 9,947 | 9,463 | 9,500 |
| Turnover | 51,980 | 50,982 | 53,715 |
| Operating margin | 16.8% | 24.8% | 16.7% |
| Underlying operating margin | 19.1% | 18.6% | 17.7% |
Paragraphs:
Underlying operating profit and underlying operating margin
Underlying operating profit and underlying operating margin mean operating profit and operating margin before the impact of non-underlying items within operating profit. Underlying operating profit represents our measure of segment profit or loss as it is the primary measure used for making decisions about allocating resources and assessing performance of the segments.
The Group reconciliation of operating profit to underlying operating profit is as follows:
Further details of non-underlying items can be found in note 3 on page 96 of the consolidated financial statements.
Refer to Note 2 on page 94 for the reconciliation of operating profit to underlying operating profit by Division. For each Division operating margin is computed as operating profit divided by turnover and underlying operating margin is computed as underlying operating profit divided by turnover.
Question:
What is the increase / (decrease) in the operating margin from 2018 to 2019?
Answer: 16.8 - 24.8 = -8