pre_text: Cash flow Net cash flow from operating activities decreased by $4.8 million to $142.9 million from $147.7 million in the prior period. The small overall decrease was due to a $9.9 million reduction in the cashflow outflow on exceptional items, a $7.0 million improved use of working capital within the business, both being offset by an increase in overheads, primarily in relation to Sales and Marketing expenses. Unlevered free cashflow decreased by $15.8 million to $123.8 million from $139.6 million in the prior-period representing the reduction in net cash flow from operating activities adjusted for the cashflow impact of exceptional items. 1 Restated for the adoption of IFRS 15 and change in accounting policy in respect of research and development expenditure tax credit scheme (“RDEC”) and provision for interest on uncertain tax positions, as explained in note 2 of the Financial Statements 2 Unlevered free cash flow is also represented by the sum of the marked rows and has been presented to enhance understanding of the Group’s cash generation capability 3 Excludes non-cash movements on exceptional items
table: FY19 FY181
table: $M $M
table: Cash EBITDA2 167.9 199.2
table: Net deferral of revenue (49.7) (129.6)
table: Net deferral of expenses 0.9 8.4
table: Foreign exchange 1.5 (8.1)
table: Depreciation (11.6) (11.6)
table: Adjusted operating profit 109.0 58.3
table: Net deferral of revenue 49.7 129.6
table: Net deferral of expenses (0.9) (8.4)
table: Exceptional items 3 (3.1) (13.0)
table: Depreciation 11.6 11.6
table: Foreign exchange (1.5) 8.1
table: Change in working capital 2 (5.2) (12.2)
table: Corporation tax paid 2 (16.7) (26.3)
table: Net cash flow from operating activities 142.9 147.7
table: Exceptional items 3 3.1 13.0
table: Net capital expenditure 2 (22.2) (21.1)
table: Unlevered free cash flow 123.8 139.6
question: Analyse this data from a financial earnings document. What was the percentage change in adjusted operating profit in 2019 from 2018?