Professional refers to somebody who earns a living by doing something, therefore only sponsored athletes are professional. The majority of athletes aren't professional.
There are more than 1,000 professional athletes in Europe.
100%
There number of the professional black athletes is in the tens of thousands. Most of the athletes disciplines is dominated by the black athletes from different parts of the globe.
What kind of athletes
Yes
Professional athletes do it because it's their job. The rest do it because they want to, or strive to become a professional.
80%
all athletes are educated, but the amount of it varies.
There are 10's of thousands of professional athletes across dozens of sports. The list you are requesting would number in the thousands.
no
California