According to the INSPIRE Directive (2007/2/EC) each Member State has to prepare and submit to the European Commission every year a Monitoring report which contains a number of indicators indicating the implementation and use of spatial data infrastructure. The information contained in the document includes a list of spatial data sources and services that are part of the National Spatial Data Infrastructure.
The annual report on Monitoring the implementation of INSPIRE for the European Commission certainly includes a measurable contribution from NSDI subjects. This year's questionnaire was sent to all NSDI subjects that have spatial data sources reported in typical spatial data formats and are thus included in the INSPIRE Monitoring report for 2016.
As well as previous reports, this year Monitoring report is available on the web site http://cdr.eionet.europa.eu/hr/eu/inspire/monitoring/envwrmuzq/