It would also be interesting to look at selected majors across ethnic groups. I suspect that blacks go in to CS at a lower rate than other ethnic groups.
If the applicant pool is disproportionately skewed, you cannot expect the employee base to be any different, and minorities will stick out (which in turn is not necessarily bad for the people if they are good at what they do)...
The percentage of women is relatively low too, but surprisingly, it was at a higher percentage than most of the companies I've worked at.
And tbh, I've only had the chane to work with 1 total black engineer anywhere in my 20+ years of software development. He was very, very good at his job. Total # of people who I've interviewed who were black was less than 5.
To me, the only way to fix it is well before middle school to get them excited about computers because tbh, what I get is a trickle of applicants (and even fewer who are qualified).