Table:
| $ million | 2019 | Adjusted operating margin 1, 2 % | 2018 | Adjusted operating margin 1, 2 % |
| --- | --- | --- | --- | --- |
| Networks & Security | 73.9 | 23.1 | 56.4 | 19.8 |
| Lifecycle Service Assurance | 18.1 | 16.3 | 17.4 | 15.4 |
| Connected Devices | 9.5 | 13.1 | 10.5 | 13.3 |
| Corporate | (8.6) |  | (7.2) |  |
| Adjusted operating profit1 | 92.9 | 18.4 | 77.1 | 16.2 |
| Exceptional items | 0.5 |  | (13.1) |  |
| Acquisition related costs | (0.1) |  | – |  |
| Acquired intangible asset amortisation | (1.2) |  | (3.7) |  |
| Share-based payment | (3.5) |  | (2.8) |  |
| Reported operating profit | 88.6 |  | 57.5 |  |
Paragraphs:
Operating profit
Notes
1. Before exceptional items, acquisition related costs, acquired intangible asset amortisation and share-based payment amounting to $4.3 million in total (2018 $19.6 million).
2. Adjusted operating profit as a percentage of revenue in the period.
Adjusted operating profit increased by $15.8 million or 20.5 per cent to $92.9 million in 2019, compared with $77.1 million in 2018. Adjusted operating margin increased by 2.2 per cent to 18.4 per cent, from 16.2 per cent in 2018.
Reported operating profit was up by $31.1 million or 54.1 per cent to $88.6 million (2018 $57.5 million). Total adjusting items were lower in 2019 at $4.3 million, compared to $19.6 million in 2018, mainly due to exceptional items totalling $13.1 million charged last year (see below).
Question:
What was the percentage change in operating profit under Networks & Security?
Answer: (73.9-56.4)/56.4 = 31.03