Did you just subtract the values in the original chart from 100%? If so, that's not the actual employment level. Unemployment means seeking work but not finding it; it excludes everyone who is disabled, discouraged, or simply not looking for work (e.g. full-time moms).

The overall unemployment level in the U.S. is a little under 10%, but the employment level is somewhere around 65-70% (iirc). So 20-25% of the population is still unaccounted for in this figure. A chart breaking that down by education might be interesting, too.