pre_text: Gross margin The Group achieved further gross margin expansion in 2019 with an increase of 1.0 percentage points, to 73.2 per cent from 72.2 per cent in 2018. This followed an increase of 0.7 percentage points last year. Once again, all the operating segments achieved an improvement in gross margin, benefiting from new product launches and a higher proportion of software sales.
table: $ million 2019 % 2018 %
table: Networks & Security 232.3 72.6 205.3 72.0
table: Lifecycle Service Assurance 88.6 79.7 87.9 77.9
table: Connected Devices 47.7 65.8 51.3 64.9
table: 368.6 73.2 344.5 72.2
question: Analyse this data from a financial earnings document. What was the change in the amount of gross profits?