Shortflyer, you are never going to get close to a realistic figure with this method.
Are you hoping every person looking for a job is on pprune?.......................... Are you looking just for the currently unemployed people, or jobseekers who currently fly outside of an airline too? (I currently fly a Bizjet and am looking for an airline job)
Look for CAA license issues over the last couple of years maybe (they used to publish them)?
Might be better to have people make an educated guess at a figure.
Anyway......
4400TTish
1200PIC
EFIS/Jet type