This year I have been conducting research concerning the percentage of mentally unhealthy people for an upcoming project.

I am interested in:

Statistics about America, other countries, and global

Not just mental illnesses (Skitzophrenia, Bipolar disorder, Autism spectrum), but also less several mental unhealth (difficulty holding long-term relationships, not feeling fulfilled, phobias).

The precise definition of mental health and mental illness

Conducting primary research, if necessary

Here is what I have found, so far: