2019 (IFRS 15)
2018 (IAS 18)
Change
Year to 31 March
£m
£m
£m
%
Adjusted a revenue
4,735
5,013
(278)
(6)
Adjusted a operating costs
4,230
4,579
(349)
(8)
Adjusted a EBITDA
505
434
71
16
Depreciation & amortisation
370
424
(54)
(13)
Adjusted a operating profit
135
10
125
1,250
Capital expenditure
245
278
(33)
(12)
Normalised free cash flow b
296
118
178
151

text: Global Services
text: Adjusteda revenue £4,735m
£4,735m
text: Adjusteda operating profit
£135m
text: Global Services operates in a global market that continues to experience high levels of change driven by both rapid technology innovation and a dynamic competitive landscape. Customers’ demands continue to evolve towards more flexible, on-demand models and new cloud-based and software-defined networking solutions. We continue to execute our Digital Global Services transformation programme to focus our business, standardise our operations, transform our underlying infrastructure, and provide innovative solutions to address the changing demands of our customers. We are focused on around 800 multinational companies and financial institutions served by three global industry verticals.
text: Adjusteda revenue for the year was down 6%, in line with our strategy to de-emphasise low margin business and including the impact of divestments. This includes a £35m negative impact from foreign exchange movements, primarily reflecting lower IP Exchange volumes and equipment sales.
text: Adjusteda operating costs for the year were down 8% mainly reflecting the decline in IP Exchange volumes and equipment sales and lower labour costs from our ongoing restructuring programme. Adjusteda EBITDA for the year was up £71m reflecting the reduction in operating costs and certain one-offs, more than offsetting the impact of lower revenue.
text: Depreciation and amortisation was down 13% for the year due to closure of certain projects in the prior year.
text: Capital expenditure was down 12% for the year reflecting ongoing rationalisation and our strategy to become a more asset light business. Normalised free cash flowb for the year improved by 151% to £296m, reflecting higher EBITDA, lower capital expenditure and improved working capital.
text: Total order intake was £3.3bn, down 15% year on year continuing to reflect a shift in customer behaviour, including shorter contract lengths and greater prevalence of usage-based terms.
text: a Adjusted measures exclude specific items, as explained in the Additional Information on page 185. b Free cash flow after net interest paid, before pension deficit payments (including the cash tax benefit of pension deficit payments) and specific items. c Openreach comparatives have been re-presented to reflect the transfer of Northern Ireland Networks from Enterprise to Openreach.

Questions:
question: What is the  Adjusted a revenue for 2019?
answer: 4,735
scale: million
question: What is the reason for Adjusteda operating costs percentage decrease?
answer: mainly reflecting the decline in IP Exchange volumes and equipment sales and lower labour costs from our ongoing restructuring programme
question: What is the Capital expenditure for 2019?
answer: 245
scale: million
question: What was the average Adjusted EBITDA for 2018 and 2019?
answer: 469.5
derivation: (505 + 434) / 2
scale: million
question: What  was the EBITDA margin in 2019?
answer: 0.11
derivation: 505 / 4,735
question: What is the average Adjusteda operating costs for 2018 and 2019?
answer: 4404.5
derivation: (4,230 + 4,579) / 2
scale: million