How many people work in various fields of psychology?

I need information or a website telling how many people work in as many of the following fields as possible:

1. clinical psychology
2. counseling psychology
3. educational psychology
4. forensic psychology
5. legal psychology
6. health psychology
7. engineering psychology
8. industrial and organizational psychology
9. School psychology

Also, necessary education, job descriptions, salaries, etc. would be helpful.