Since its establishment by the Maastricht Treaty the office has developed continuously as is reflected outwardly both in the number of complaints received and in the number of staff and the changes to the office's structure.
Kopš tā izveides saskaņā ar Māstrihtas Līgumu birojs ir nepārtraukti pilnveidojies, par ko formāli liecina gan iesniegto sūdzību skaits, gan biroja strukturālo pārveidojumu un darbinieku skaits.