This issue is in the news quite often but usually discussed in a very generalised way.
Here is an interesting article which looks at the whole subject in a more detailed way.
According to this article a substantial number of victims are people with existing Mental Health issues.
"Of the 1,865 people who died from suicide in Northern Ireland during the time fame of the confidential Inquiry, 533 had had contact with mental health services in the previous 12 months – an average of 59 per year."
Depression and "mental illness" is not new, King David wrote about these things.
Psalm 42:5Why art thou cast down, O my soul? and why art thou disquieted in me?