What are the main reasons for suicides and suicide attempts?

How many suicides are there each year?

People have Depression or mental disorders.
People get mentally and or physically abused at home.
People drink, do drugs and get an addiction to them.
Finally, some people feel hopeless and feel like their life is a burden to others.

There are about 100,000 deaths from suicide in America , but in total of everywhere, there are about 800,000 deaths from suicide.