Less than 18 months is about the length of time to work somewhere, get a crap raise after an annual review, have a look around and realise you could be better-p

Less than 18 months is about the length of time to work somewhere, get a crap raise after an annual review, have a look around and realise you could be better-paid for the same work somewhere else. Why would you stay at a company where you're being under-paid?