Well around 40% of people work. I dont think its crazy to say around a third of jobs are knowledge jobs, but what do I know

85% of the world population lives outside of developed nations.

27% of the world's workforce is in agriculture (contrast to the US where it is 1-2%). 15% in manufacturing.

A lot of people work in "services" (especially in high income nations, where it's roughly three quarters) and some of those are knowledge workers... but a huge number of them are nail technicians or hairdressers or bartenders (etc etc).