It is going to get a lot higher. We live in an economy where knowledge, not buildings and machinery, is the chief resource and where knowledge-workers make up the biggest part of the work force. Until well into the 20th century, most workers were manual workers. Again, the proportions are roughly similar for other developed countries. Workers have always had to gain skills, but knowledge is different from skill.
Skills change very slowly.
If Socrates were to return to the world and resume his trade as a stonemason, he would recognize every tool and would know how to use it. His finished product would be identical for practical purposes with the steles he hewed for a living 2,400 years ago. In all those centuries none of them had to learn a new skill. It was the same in most industries. In dressmaking there hasn't been a new skill required since a Hungarian invented the buttonhole in the 11th century.