Input (grade 13): In the course of Berlin's 2001 administrative reform it was merged with the former borough of Wilmersdorf becoming a part of a new borough called Charlottenburg-Wilmersdorf.
Output (grade 11): As a part of the changes to the boroughs of Berlin in 2001 Charlottenburg was joined with Wilmersdorf to make the new borough of Charlottenburg-Wilmersdorf.