I thought you might leap into that. 
The truth of the matter is that few employees ever file a formal complaint.
There are roughly 136 million (nonfarm) employed persons in the United States and there are roughly 100,000 charges of discrimination filed with the EEOC each year.
100,000 / 136,000,000 = 0.0007 = less than one tenth of one percent.
It is prima facie evidence, but a closer examination is required to make any definite conclusion. It is also important to recognize that the recruitment pool includes only persons whose knowledge, skills, and abilities qualify them to fulfill the job specifications associated with each of the firm’s respective job positions. Jobs that require specialized KSAs are more likely to require a larger geographic area from which to recruit candidates and fill those positions. On the other hand, a job that requires less specialized KSAs can usually be filled from a smaller subset of persons located closer to the firm’s place of business. I reside in a large metropolitan area. In that situation, matching the racial composition of employees to the recruitment pool is a bit more subjective and perhaps less meaningful – especially in smaller firms.
Another point to consider is that the EEOC is more concerned with employment practices that involve “systematic” attempts and/or methods that result in the exclusion of protected classes than it is concerned with matching an employer’s demographics to the area’s recruitment pool.
Applicants for any job should be evaluated only upon their satisfaction of properly developed job specifications. Let’s say an employer has an opening for a street sweeper. Employers are certainly entitled to hire the most qualified applicant; however, they must limit their selection criteria to KSAs that are properly validated according to the corresponding job analysis. If my skill set includes aircraft maintenance specialist, expert underwater diver, and novice broom operator~ the employer should hire “the other applicant” who is a master broom operator, rather than me. Even though my overall skill level is more broad and specialized – I am not the most qualified applicant for the position of street sweeper. On the other hand, if the employer has openings for 20 street sweepers and the recruitment pool consists of 50 equally qualified applicants of different demographic characteristics that match those of the area recruitment pool, I’d expect the composition of persons hired to also resemble the area.
Some more-sophisticated employers actually evaluate applicant data in a blind pool. Names, ages, sex, race, etc are specifically excluded from the selection pool data of qualified candidates. The data includes only items that are validated selection criteria. In such a design, the identity of the hire is not known until the selection process is completed. That is an example of how to hire the most qualified applicant.