pre_text: Billings Billings represent the value of products and services invoiced to customers after receiving a purchase order from the customer and delivering products and services to them, or for which there is no right to a refund. Billings do not equate to statutory revenue.
table: Year-ended 31 March 2019 Year-ended 31 March 2018 Restated See note 2
table: $M $M
table: Revenue 710.6 639.0
table: Net deferral of revenue (see note 23) 49.7 129.6
table: Billings 760.3 768.6
table: Currency revaluation 25.9 18.7
table: Constant currency billings 786.2 787.3
question: Analyse this data from a financial earnings document. What was the change in Revenue in 2019 from 2018?