Documentation of statistics: Indices of Average Earnings for the Private Sector (Discontinued)
Second of all, there is some uncertainty connected to the completeness in the collected data, which is often caused by errors in the way the system is generated for transmission of data.
https://www.dst.dk/en/Statistik/dokumentation/documentationofstatistics/indices-of-average-earnings-for-the-private-sector--discontinued-
Documentation of statistics