I wouldn't be so sure that there is less produced in Mandarin than in English. Spanish and Arabic might be behind but definitely not an order of magnitude. Also don't forget things like the massive film industry producing in Hindi.

Also, you original claim was that English produces more "culture" than all other languages combined which is definitely wrong. Not even one out of seven speaks English. Are you really claiming that English-speakers have on average more than six times the cultural output than non-English-speakers?

(I also don't know what your definition "produced culture" is as life is not a game of Civilization, but that's besides the point.)