That alone isn't enough data to answer the question. I arbitrarily picked 1962 as a starting point, and while the number of employees since then has approximately tripled, the population of US citizens has approximately doubled, in addition to the gradual entry of women into the work force. Additionally, the page you linked shows number of employees, and does not account for the possibility of multiple jobs effectively replacing the work of one person because of job market saturation, and an associated depression of wages.