This webpage from the World Health Organization contains key statistics about suicide around the world:
More than 700,000 people die due to suicide every year.
For every suicide there are many more people who attempt suicide. A prior suicide attempt is the single most important risk factor for suicide in the general population.
Suicide is the 4th leading cause of death among 15–19 year-olds.
77% of global suicides occur in low- and middle-income countries.
There is also more information about risk factors, methods of suicide, prevention and control, and challenges and obstacles.