Some clarifications on ISBN statistics

The National Statistics Office has released the first-ever batch of statistics dedicated to the book industry. These statistics were a work in progress which began during my tenure but I am not aware of the methodology used in its results. The ISBN statistics published by NSO seem to have left out self-publishers and some specific categories of publishers. I would need to look into further detail because the report is a bit lacking in details.  These are the actual statistics of all the ISBNs issued by the National Book Council during my tenure (minus 2021).

Back then we also started uploading all the ISBNs into an open-data database which can be found online:

https://isbndatabasemalta.org/