Research methods were revised last year, which makes the majority of statistical data unsuitable for comparison with earlier periods, the statistics agency said.
In the fourth quarter of 2017, revenue of non-financial companies for goods and services stood at 21.9 billion euros, indicating a rise by 7.1 percent from the earlier quarter, while their pre-tax profit was 1.1 billion euros, a decline by 23.7 percent from July-September.