As anticipated, the market conditions changed little during the fourth quarter. There were several positive developments in our Services business. Service orders received grew quarter-on-quarter, although there were big differences between geographical markets. We won some major orders for our digital service concepts relating to advanced installed base management and process monitoring. Despite the positive trends in Services, the overall Services and MRO-driven businesses remained at a weak level due to customers’ tight cash management, and postponements of large service and upgrade projects due to the Covid-19 pandemic.
In 2020, project business developed well. We received many orders particularly during the first half of the year and second half orders were also at a good level. Project sales increased quarter by quarter, peaking in the fourth quarter. The share of the Services and MRO-driven businesses was slightly over 60% of total orders received in 2020, compared to a bit less than 70% in 2019. We continue to see a healthy project funnel in Pulp and Paper for 2021. We are also seeing activity in Chemicals and Oil & Gas projects, but at a lower level than a year ago and with uncertainties around the timing of orders.
We continued tight cost management to keep our profitability at a good level, despite the low sales volume. We will also continue many cost saving measures at the beginning of 2021. We completed personnel negotiations for temporary layoffs at our Helsinki plant and will continue our ongoing global efforts to reallocate resources to support our strategy execution. In 2020, we reported EUR 11 million in adjustment items associated with the partial demerger, the launch of Neles, the share ownership developments which started in the second quarter, and restructuring. The activities associated with these adjusting items are largely completed. Certain development activities, in particular our ongoing ERP harmonization project, will continue in 2021 and will be reported as part of our operating costs instead of adjusting items.
We completed our annual customer satisfaction survey, and the results were very pleasing. Customer satisfaction, measured by a net promoter score, improved from 29 in 2019 to an all-time high of 38 in 2020. I feel this is strong testimony to the great commitment of Neles personnel in serving our customers and co-operating with our partners for the long-term, even in difficult times.