Depression, Suicide, and the Modern World

According to this article, Greenland is the country with the world's highest suicide rate. From 1900-1930, Greenland had a suicide rate of 0.3 per 100,000. Now it's a staggering 100 in 100,000 and is the highest in the world! Why such a huge increase? In the first half of the 20th Century they lived much as they had for the past 4000 years-- namely hunting and fishing and living in small villages. So perhaps something to do with the change in the way they live?

I suspect people are happier in small closely knit communities with a shared history and identity, where everyone knows each other, and where they do traditional work rather than doing repetitious work for some faceless company in the modern world. I would speculate the modern world, and the style of living it inaugurated, has some role to play in why so many people are depressed and commit suicide.