Doubled (total comp) every time I switched jobs, and then once without switching. It's hard to measure exactly because college & a couple startups were mixed in there, but averaged about 2-3 years of work experience per doubling. Each switch was moving from edge to center of an industry - I went from a startup writing software for schools, to financial software, to Google, and then the doubling within Google was moving from a UI-focused role to one that included UI + backend data mining. No official management positions, though I've led teams.