Unlike the presentation of R&D expenditure at the regional level, national data can be presented
in more detail.
Data are shown by main activity or by product field.
The main activity is the industrial or commercial activity which generates most of the company's turnover.
The product field on the other hand looks at the output or product (good or service) of the R&D activity as the basis of the classification, regardless of which industry produces it.
From 2008 onwards, data are presented in accordance with nace classification revision 2. For older data, nace classification revision 1.1 is used.