If service jobs pay way worse than manufacturing jobs, how come manufacturing share v. GDP per head is some kind of inverted parabola? And why are manufacturing

If service jobs pay way worse than manufacturing jobs, how come manufacturing share v. GDP per head is some kind of inverted parabola? And why are manufacturing jobs deeply unpopular with young people? https://ourworldindata.org/grapher/gdp-vs-manufacturing-employment https://ourworldindata.org/grapher/gdp-vs-manufacturing-empl...