Question on Corporate Growth Rate with Workers

I’ve tried SimCountry a few times many years ago, and back at it again. I’ve had a country in Little Upsilon for a few days, started off by selling all of my military products, and started building up education and new corporations that try to fulfill local market contracts first. My corporations are targeting 100% employment.

I’m running into an issue with lack of low/medium level workers for new corporations. I’ve mainly been exchanging medical and education workers, and dipping into other professions when needed to meet the worker requirements for new corporations. I’ve noticed that low/medium unemployed worker count goes down overnight (several ingame months) even when I don’t have a corporation being constructed.

My question is where are those unemployed workers going? I thought that my newer corps all buying auto upgrades would reduce my low/medium/high worker employment count and increase other educated roles like managers and engineers.

For added context, my new corporations are showing a reduction of overall worker count at a rate of about 1000 less workers every 2-3 months.

Low level workers that gain job experience can become medium, and medium can promote to high level workers. This is one way they can decline.

Another way is through death. If you check their ages, you'll see that there is a death rate for each age bracket.

And if they are old enough: they might be retiring.

Some may become disabled.

Some may leave the country for better pay or living conditions elsewhere.

Off the top of my head, those are 5 ways their numbers could decline.