@graf Year 16, the year of more people without tools.
I am constructing a coal mine so that steel tools can be made, which last twice as long.
I am also going to open some schools so that people can be educated. Educated citizens know how to use their picks, hammers, axes, hoes, etc, and how to gather herbs/mushrooms, hunt deer, catch fish, etc, far more efficiently.
Soon, they will be as effective as the men in the video.