There are many reasons for that, unfortunately recently its been on high alerts in many countries. Suicide rates will continue to rise, sadly to say.

Increasing sense of isolation among young people, rise of technology - internet for example - people are staying connected without meeting live and seeing other people's lives on fb for instance are better then theirs, and so on.

Drug abuse & alcoholism.

Pressure at all levels, work, family and so on, constant stress, lack of money.

All this and many other reasons brings to high level of depression so that people cant handle it.