Given that university attended practically determines hiring options subsequently I have doubts about the relevance of the survey. Survey Waseda grads and you'll get a list of government departments they are hoping to work in. Survey Todai students and you'll get a list of major Jpns 'name' corporations. "Dream jobs" doesn't really mean much to the average Jpns student IMO. They might have a dream job function, but few have a company in mind IME.