After I post a job to hire a developer or designer (freelance), I get one application every five minutes, until the job gets taken down. Say I leave the post up for a week, that means that I have 2,000 applications to sort through.
It is shocking to see the quality of inbound responses.
60% obviously don't read the job post, 10% read it but don't make an effort to do anything other than the bare minimum, 10% have a huge delta in skills vs expected salary, and the rest are a mixed bag but at least made an effort.
I think these numbers stack up pretty accurately across my day-to-day interactions with people in the world. 60% are totally checked out, 10% are doing the bare minimum, 10% show up but are maybe in the wrong role.
So 1 in 5 people can be expected to care and make some sort of impact.