Ten years ago, 30.5% of Flint's non farm employment was in manufacturing. Today 5.3% of Flint's non farm employment is in manufacturing. That's now lower than Ann Arbor at 6.5%.
As much as everybody thinks of Flint as a blue-collar, manufacturing town, it's gradually become a service-based economy (see a related discussion here on the Flint Expatriates blog).