Hi, could you help me out on how much should I earn as a Patent Attorney at a small private practice in Zurich?

Age:30
Years in the company: 4
Qualification: University degree
Languages: English (advanced level, almost native), German (medium, TELC level C1), Polish (mother tongue)

By how much should this salary increase if I pass the European Qualifying Examination (for those who don't know: its THE most difficult and important exam in the field)

Thanks