What is the average % increase in salary when one changes job?

It all depends I guess. My first jump going to different industry gets me 35% increment. Second jump about 20% (now at the low $4k range). If I make a jump in the next 1-2 mths, that will probably be 15-25%

Based on many factors - demand/supply, budget, how the company needs manpower, industry and vice versa. Difficult to put dollar or %age. If put high %age as standard (sounds super nice and macam helping ppl sharing info) - then ppl may feel they are short-changed (if they get lesser) which is ultra misleading.

It really depends on the industry and job but I got a 15% after negotiation.. now the economy is bad so you can't expect as much too. Depends on how profit making your role is and how desperate they are too.

Managed to snag an approximate 74% jump in base changing careers. Comes with quite a bit of changes to work patterns though.